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1
Vlachos, Filippos, Francois Gaillard, Kiriazis Vaitsis, and Argiris Karapetsas. "Developmental Risk: Evidence from Large Nonright-Handed Samples." Child Development Research 2013 (July 22, 2013): 1–10. http://dx.doi.org/10.1155/2013/169509.
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The aim of the present study is twofold. First, we tested the view that individuals who do not develop a typically strong behavioral laterality are distributed differentially among the two genders across age. Second, we examined whether left handedness and mixed handedness are associated with an elevated risk of some developmental or cognitive deficits. A special recruitment procedure provided norms of the Rey-Osterrieth Complex Figure (ROCF) copy from large samples of left-handed () and mixed-handed () compared to right-handed () schoolchildren and adults (). This graphic task was considered as reflective of the growth of visual-spatial skills and impairment at copying as a developmental risk. Subjects’ hand preference was assessed by the Edinburgh Handedness Inventory. Data analysis indicated that (1) the trend towards consistent right handedness is sex related. Girls are clearly ahead of boys in this lateralization process, and boys are overrepresented in mixed-handed subjects. The greater prevalence of mixed-handed boys compared to girls decreases with age. (2) Performance on drawing the ROCF varies according to age and handedness groups. Mixed-handed subjects scored worse in all age groups. The results are discussed in relation to the hormonal-developmental, neuropathological, and learning theories of lateralization.
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Nakada, Tsutomu, Yukihiko Fujii, and Ingrid L. Kwee. "Coerced training of the nondominant hand resulting in cortical reorganization: a high-field functional magnetic resonance imaging study." Journal of Neurosurgery 101, no. 2 (August 2004): 310–13. http://dx.doi.org/10.3171/jns.2004.101.2.0310.
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Object. The authors investigated brain strategies associated with hand use in an attempt to clarify genetic and nongenetic factors influencing handedness by using high-field functional magnetic resonance imaging. Methods. Three groups of patients were studied. The first two groups comprised individuals in whom handedness developed spontaneously (right-handed and left-handed groups). The third group comprised individuals who were coercively trained to use the right hand and developed mixed handedness, referred to here as trained ambidexterity. All trained ambidextrous volunteers were certain that they were innately left-handed, but due to social pressure had modified their preferred hand use for certain tasks common to the right hand. Although right-handed and left-handed volunteers displayed virtually identical cortical activation, involving homologous cortex primarily located contralateral to the hand motion, trained ambidextrous volunteers exhibited a clearly unique activation pattern. During right-handed motion, motor areas in both hemispheres were activated in these volunteers. During left-handed motion, the right supplemental motor area and the right intermediate zone of the anterior cerebellar lobe were activated significantly more frequently than observed in naturally right-handed or left-handed volunteers. Conclusions. The results provide strong evidence that cortical organization of spontaneously developed right- and left-handedness involves homologous cortex primarily located contralateral to the hand motion, and this organization is likely to be prenatally determined. By contrast, coerced training of the nondominant hand during the early stages of an individual's development results in mixed handedness (trained ambidexterity), indicating cortical reorganization.
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Mouloua, Salim A., Mustapha Mouloua, Daniel S. McConnell, and P. A. Hancock. "The Effects of Handedness and Dominance on Motor Task Performance." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 62, no. 1 (September 2018): 1237–41. http://dx.doi.org/10.1177/1541931218621284.
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Two studies were carried out to examine the effects of user handedness and hand dominance on a motor task using Fitts’ law. Study one was designed to validate our previous findings showing differences between left- and right-handed participants who completed a mouse-pointing task using Fitts’ law. Results showed that right-handed participants were significantly faster than their left-handed peers, thereby validating our previous findings. Study two examined the effect of handedness and hand dominance on motor task performance by requiring two groups of left- and right-handed participants perform the motor task using both their dominant and non-dominant hands. Results showed a significant interaction between handedness and hand dominance on task performance. Right-handed participants were again significantly faster than their left-handed peers when both groups were using their dominant hand. However, left-handed participants were significantly faster than their right-handed peers when both groups were using their non-dominant hand. These findings might be attributed to prior training with computer mice designs that do not account for user handedness. Both theoretical and practical implications, as well as directions for future studies are also discussed.
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Shirani, Afsaneh, Anne H. Cross, and Robert T. Naismith. "The association between handedness and clinicodemographic characteristics in people with multiple sclerosis: a brief report." Multiple Sclerosis Journal - Experimental, Translational and Clinical 5, no. 1 (January 2019): 205521731983203. http://dx.doi.org/10.1177/2055217319832031.
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A relationship between handedness and clinicodemographic profiles of people with multiple sclerosis was sought using data from the Multiple Sclerosis Partners Advancing Technology Health Solutions network of 10 multiple sclerosis centers in the USA and Europe. Handedness data were available for 8888 multiple sclerosis patients, of which 917 (10.3%) were left-handed. Clinicodemographic profiles of right versus left-handed multiple sclerosis patients were similar except for a slightly increased proportion of men who were left-handed, and slightly reduced performance on the manual dexterity test using the non-dominant hand in left-handed patients. We found no evidence to suggest a prognostic implication of handedness in multiple sclerosis.
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Nikolaeva, Elena Ivanovna, and Elizaveta Denisovna Golovacheva. "Comparative analysis of aggression levels in left-handed and right-handed adolescents." Science for Education Today 11, no. 1 (February 27, 2021): 31–41. http://dx.doi.org/10.15293/2658-6762.2101.02.
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Introduction. The study examines the problem of aggression in education. Previous studies have discussed a number of reasons for school aggression. Left-handedness is frequently reported as an important risk factor of aggressive behaviours. The aim of this study is to compare the levels of aggressiveness between right-handed and left-handed adolescents. Materials and Methods. To date there has been little agreement on the assessment of handedness in scholarly literature. The authors of this article have divided the inventories aimed at assessing handedness into two groups: those identifying genetic predisposition, and those that assess the influence of social pressure. The study was conducted in St. Petersburg and involved 86 secondary school students aged between 11 and 15 years. Handedness was assessed using 7 tools frequently mentioned in scholarly literature. To assess the aggressiveness, the authors used Ch.D. Spielberger’s questionnaire (STAXI) adapted by A.B. Leonova. Results. It was found that the use of different inventory sets for assessing handedness significantly changes the distribution of adolescents according to this parameter. Tools which do not take into account social pressure identify significantly more left-handed people than those that depend on social pressure. The study has not identified significant differences between right-handed and left-handed adolescents in terms of the level of aggressiveness. At the same time, it was revealed that aggressiveness directed outward is higher in supposedly retrained left-handers. Conclusions. The study has not shown any significant differences in the level of aggressiveness between left-handed and right-handed adolescents. Future research should concentrate on the investigation of aggressiveness in retrained heft-handed adolescents.
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Mohebbi, Mehrnaz, Saeid Mahmoudian, Marzieh Sharifian Alborzi, Mojtaba Najafi-Koopaie, Ehsan Darestani Farahani, and Mohammad Farhadi. "Auditory Middle Latency Responses Differ in Right- and Left-Handed Subjects: An Evaluation Through Topographic Brain Mapping." American Journal of Audiology 23, no. 3 (September 2014): 273–81. http://dx.doi.org/10.1044/2014_aja-13-0059.
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Purpose To investigate the association of handedness with auditory middle latency responses (AMLRs) using topographic brain mapping by comparing amplitudes and latencies in frontocentral and hemispheric regions of interest (ROIs). Method The study included 44 healthy subjects with normal hearing (22 left handed and 22 right handed). AMLRs were recorded from 29 scalp electrodes in response to binaural 4-kHz tone bursts. Results Frontocentral ROI comparisons revealed that Pa and Pb amplitudes were significantly larger in the left-handed than the right-handed group. Topographic brain maps showed different distributions in AMLR components between the two groups. In hemispheric comparisons, Pa amplitude differed significantly across groups. A left-hemisphere emphasis of Pa was found in the right-handed group but not in the left-handed group. Conclusion This study provides evidence that handedness is associated with AMLR components in frontocentral and hemispheric ROI. Handedness should be considered an essential factor in the clinical or experimental use of AMLRs.
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Milenkovic, Sanja, Goran Belojevic, Katarina Paunovic, and Dragana Davidovic. "Historical aspects of left-handedness." Srpski arhiv za celokupno lekarstvo 147, no. 11-12 (2019): 782–85. http://dx.doi.org/10.2298/sarh190522095m.
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Lateralization is one of the central questions in neurology, neuropsychology, and other related scientific disciplines. There has been very little change in the proportion of left-handers since the Upper Paleolithic Age about 10,000 years ago and it is estimated to be around 10%. As the history of human thinking has developed from superstition to science, the explanation of left-handedness transformed from ?devil?s work? to neurological specificity. This paper presents this very interesting historical change by analyzing the data on left-handedness and the attitudes towards it in human societies from prehistory to today. Even in a relatively open-minded society, parents and teachers may encourage a left-handed child to switch to right-handedness to make their lives easier in a largely right-handed world. On the other hand, left-handedness is increasingly seen as a special gift, and left-handed people have started to favor themselves as more competent in relation to the right-handed people.
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Dane, Şenol, and Mehmet Bayirli. "Correlations between Hand Preference and Durations of Hearing for Right and Left Ears in Young Healthy Subjects." Perceptual and Motor Skills 86, no. 2 (April 1998): 667–72. http://dx.doi.org/10.2466/pms.1998.86.2.667.
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In this study, to test an inference from the 1991 Previc hypothesis that right-handers have a right-ear advantage, the durations of hearing for the right and left ears were compared for 81 right- and 45 left-handed high school students. In the present study, right-handedness was associated with a right-ear advantage and left-handedness was associated with a left-ear advantage. In addition, there was a significant positive correlation between the durations of hearing for the right and left ears and the scores for right-handedness for right-handed subjects. The durations of hearing for the right and left ears were negatively correlated with the left-handedness for left-handed subjects. These results suggest hand preference may be related to asymmetry of aural sensitivity.
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Hashimoto, Takashi. "Molecular genetic analysis of left–right handedness in plants." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 357, no. 1422 (June 29, 2002): 799–808. http://dx.doi.org/10.1098/rstb.2002.1088.
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Handedness in plant growth may be most familiar to us when we think of tendrils or twining plants, which generally form consistent right– or left–handed helices as they climb. The petals of several species are sometimes arranged like fan blades that twist in the same direction. Another less conspicuous example is ‘circumnutation’, the oscillating growth of axial organs, which alternates between a clockwise and an anti–clockwise direction. To unravel molecular components and cellular determinants of handedness, we screened Arabidopsis thaliana seedlings for helical growth mutants with fixed handedness. Recessive spiral1 and spiral2 mutants show right–handed helical growth in roots, hypocotyls, petioles and petals; semi–dominant lefty1 and lefty2 mutants show opposite left–handed growth in these organs. lefty mutations are epistatic to spiral mutations. Arabidopsis helical growth mutants with fixed handedness may be impaired in certain aspects of cortical microtubule functions, and characterization of the mutated genes should lead us to a better understanding of how microtubules function in left–right handedness in plants.
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Mouloua, Adam S., Mustapha Mouloua, Peter Hancock, and Daniel McConnell. "The Effects of Computer User Handedness on a Mouse-Clicking Task." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 61, no. 1 (September 2017): 1220–23. http://dx.doi.org/10.1177/1541931213601787.
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The present study examined computer user handedness on a motor task using Fitts’s Law. Results indicated that right-handed participants were significantly faster than the left-handed participants when performing the motor task as measured by the Index of Performance. This finding could be partially attributed to the mouse design that is inconsistent with differential user handedness. Conversely, this finding could also be partially attributed to the degree of training left-handed participants received relative to their right-handed counterparts. The right-handed users outperformed their counterpart left-handed users perhaps because of physical design biases or relative degree of training. The present findings have practical implications for computer input device such as game controllers, joysticks, or mice that are physically designed for right-handed users.
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Ivancevic, Nikola, Marija Novicic, Vera Miler-Jerkovic, Milica Jankovic, Dejan Stevanovic, Blazo Nikolic, Mirjana Popovic, and Jasna Jancic. "Does handedness matter? Writing and tracing kinematic analysis in healthy adults." Psihologija 52, no. 4 (2019): 413–35. http://dx.doi.org/10.2298/psi181229014i.
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Writing is a complex skill and it can be affected by many factors. One of the most obvious is handedness. The actual influence of handedness (especially left-handedness, since almost 10% of the population is left-handed) onto writing performance has not been fully studied in previous research. Digitalized kinematic analyses and assessments of writing strategies (i.e., graphic rules and principles) are two approaches to investigating writing characteristics poorly addressed in previous research. The aim of this study was to analyze the effects of handedness onto writing kinematics using the aforementioned approach. The study included 34 young healthy adults (of whom 11 were left-handed) performing three writing tasks on a digital board. The tasks included semicircle and figure tracing and cursive letter writing. Regarding kinematics, left-handers performed tracing movements with higher mean horizontal acceleration and lower mean horizontal jerk compared to right-handed subjects. In addition, the left-handed wrote less accurately (i.e., undershooting more writing borders) and made more pauses during the letter writing task. The obtained results suggest that handedness slightly affects writing performance, and since left- and right-handers use the same cognitive strategies to writing and tracing, the observed differences could be mainly due to biomechanical constraints, what needs further studies in more representative samples.
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Sarma, P. S. B. "Mixed Handedness and Achievement Test Scores of Middle School Boys." Perceptual and Motor Skills 107, no. 2 (October 2008): 497–506. http://dx.doi.org/10.2466/pms.107.2.497-506.
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The purpose of the study was to replicate findings of an earlier study of fourth grade boys manifesting mixed handedness with a sample. Among 32 mixed-handed boys in Grades 6 to 8, the right-handed writer, left-handed thrower group obtained low spelling scores (Normal Curve Equivalent Scores) on the California Achievement Test significantly more frequently than the left-handed writer, right-handed thrower group. These findings are consistent with data for Grade 4 boys in the earlier study. Findings strengthen the hypotheses that mixed handedness is not a unitary neuropsychological entity and that boys who write with the right hand and throw with the left hand might be at risk for certain academic deficits.
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Dane, Şenol, Murat Karaşen, Önder Şahin, and Emre Öztop. "Lateralization of Squamous Cell Carcinomas in the Head-Neck Region." Perceptual and Motor Skills 100, no. 1 (February 2005): 258–62. http://dx.doi.org/10.2466/pms.100.1.258-262.
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Earlier studies have shown the lateralization of several immune disorders, including herpes zoster infection and breast cancer. We investigated whether there is lateralization of squamous cell carcinomas in the head-neck region and a relation of handedness with this cancer. Analysis showed right-sided lateralization of head-heck cancers in right-handed patients and vice versa in left-handed ones and a higher rate of left-handedness in patients with squamous cell cancer. Associations among left-handedness, squamous cell carcinoma, and its lateralization may result from a genetic togetherness.
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Rueda, I., I. Banegas, I. Prieto, R. Wangensteen, AB Segarra, AB Villarejo, M. De Gasparo, et al. "Handedness and gender influence blood pressure in young healthy men and women: A pilot study." Endocrine Regulations 50, no. 1 (January 1, 2016): 10–15. http://dx.doi.org/10.1515/enr-2016-0003.
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AbstractObjective. The type and level of sex steroids influence blood pressure (BP). It has been suggested that functional brain asymmetries may be influenced by sex hormones. In addition, there are inter-arm differences in BP not yet related with handedness. In this study, we hypothesize a possible association between sex hormones, handedness, and inter-arm differences in blood pressure.Methods. To analyze this hypothesis, we measured BP in the left and right arm of the left and right handed adult young men and women in menstrual and ovulatory phase and calculated their mean arterial pressure (MAP).Results. Significant differences depending on sex, arm, handedness or phase of the cycle were observed. MAP was mostly higher in men than in women. Remarkably, in women, the highest levels were observed in the left handed in menstrual phase. Interestingly, the level of handedness correlated negatively with MAP measured in the left arm of right-handed women in the ovulatory phase but positively with the MAP measured in the right arm of right-handed women in the menstrual phase.Conclusions. These results may reflect an asymmetrical modulatory influence of sex hormones in BP control.
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Takahashi, H., N. Yahata, M. Matsuura, K. Asai, Y. Okubo, H. Tanaka, and M. Koeda. "Neural Responses to Human Voice and Hemisphere Dominance for Lexical-semantic Processing." Methods of Information in Medicine 46, no. 02 (2007): 247–50. http://dx.doi.org/10.1055/s-0038-1625416.
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Summary Objectives : In our previous functional magnetic resonance imaging (fMRI) study, we determined that there was distinct left hemispheric dominance for lexical- semantic processing without the influence of human voice perception in right-handed healthy subjects. However, the degree of right-handedness in the right-handed subjects ranged from 52 to 100 according to the Edinburgh Handedness Inventory (EHI) score. In the present study, we aimed to clarify the correlation between the degree of right-handedness and language dominance in the fronto-temporo-parietal cortices by examining cerebral activation for lexical-semantic processing. Methods : Twenty-seven normal right-handed healthy subjects were scanned by fMRI while listening to sentences (SEN), reverse sentences (rSEN), and identifiable non-vocal sounds (SND). Fronto-temporo-parietal activation was observed in the left hemisphere under the SEN - rSEN contrast, which included lexical- semantic processing without the influence of human voice perception. Laterality Indexwas calculated as LI = (L - R)/(L + R) X 100, L: left, R: right. Results : Laterality Index in the fronto-temporo-parietal cortices did not correlate with the degree of right-handedness in EHI score. Conclusions : The present study indicated that the degree of right-handedness from 52 to 100 in EHI score had no effect on the degree of left hemispheric dominance for lexical-semantic processing in right-handed healthy subjects.
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Fagard, Jacqueline, Maria De Agostini, Viviane Huet, Lionel Granjon, and Barbara Heude. "Is Handedness at Five Associated with Prenatal Factors?" International Journal of Environmental Research and Public Health 18, no. 7 (March 29, 2021): 3529. http://dx.doi.org/10.3390/ijerph18073529.
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The goal of the study was to investigate some of the factors suspected to be related to children’s handedness: presentation during the last weeks of gestation and at birth (cephalic or breech), side of presentation (right or left), number of weeks of gestation, season of birth, parents’ handedness and sex. We analyzed the relationships between these factors and the child’s handedness at five years. Children (n = 1897) from the EDEN cohort participated in the study, among which 1129 were tested for handedness at five. The father’s handedness, but not the mother’s, was significantly related to the child’s hand preference. The percentage of left-handed children was significantly larger when the father was non-right-handed compared to right-handed, and tended to be larger among children in non-left-cephalic presentation compared to left-cephalic presentation. Girls, but not boys, were significantly less lateralized when they were born before 37 weeks of pregnancy than after. Finally, children born in winter or spring were slightly but significantly less lateralized than children born in summer or autumn. All six children who were not lateralized at 5 presented one or several of these factors. These results are discussed in light of the mixed model of handedness.
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Karpychev, Victor, Tatyana Bolgina, Svetlana Malyutina, Victoria Zinchenko, Vadim Ushakov, Grigory Ignatyev, and Olga Dragoy. "No Association Between Structural Properties of Corpus Callosum and Handedness: Evidence from the Constrained Spherical Deconvolution Approach." Russian Journal of Cognitive Science 7, no. 3 (September 30, 2020): 68–77. http://dx.doi.org/10.47010/20.3.4.
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Handedness is the most prominent trait of functional asymmetry in humans, associated with lateralized cognitive functions and considered in relation to mental disorders. However, the neuroanatomical correlates of handedness are still unclear. It has been hypothesized that the structural properties of sub-regions of the corpus callosum (CC) are linked to handedness. Nevertheless, tractography studies of the relation between directly measured structural properties of CC subregions and handedness are lacking. The Constrained Spherical Deconvolution (CSD) approach enables full reconstruction of the sub-regions of the CC. The current study aimed to investigate the relation between the structural properties of the CC, such as volume and the CSD metric, referred to as hindrance modulated orientational anisotropy (HMOA), and handedness. Handedness was considered in two dimensions: direction (right-handed, ambidextrous, left-handed) and degree (the absolute values of Handedness quotient). We found no association between 1) volume or HMOA as a proxy of microstructural properties, namely the axonal diameter and fiber dispersion, of each sub-region and 2) either the direction or the degree of handedness. These findings suggest the absence of a direct relation between sub-regions of the CC and handedness, demonstrating the necessity of future tractography studies.
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Karpychev, Victor, Tatyana Bolgina, Svetlana Malyutina, Victoria Zinchenko, Vadim Ushakov, Grigory Ignatyev, and Olga Dragoy. "No Association Between Structural Properties of Corpus Callosum and Handedness: Evidence from the Constrained Spherical Deconvolution Approach." Russian Journal of Cognitive Science 7, no. 3 (September 30, 2020): 68–77. http://dx.doi.org/10.47010/20.3.4.
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Handedness is the most prominent trait of functional asymmetry in humans, associated with lateralized cognitive functions and considered in relation to mental disorders. However, the neuroanatomical correlates of handedness are still unclear. It has been hypothesized that the structural properties of sub-regions of the corpus callosum (CC) are linked to handedness. Nevertheless, tractography studies of the relation between directly measured structural properties of CC subregions and handedness are lacking. The Constrained Spherical Deconvolution (CSD) approach enables full reconstruction of the sub-regions of the CC. The current study aimed to investigate the relation between the structural properties of the CC, such as volume and the CSD metric, referred to as hindrance modulated orientational anisotropy (HMOA), and handedness. Handedness was considered in two dimensions: direction (right-handed, ambidextrous, left-handed) and degree (the absolute values of Handedness quotient). We found no association between 1) volume or HMOA as a proxy of microstructural properties, namely the axonal diameter and fiber dispersion, of each sub-region and 2) either the direction or the degree of handedness. These findings suggest the absence of a direct relation between sub-regions of the CC and handedness, demonstrating the necessity of future tractography studies.
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Das, Beauty, Jed Meltzer, and Blair Armstrong. "Quantitative Assessment of Handedness and Cerebral Lateralization." UTSC's Journal of Natural Sciences 2, no. 1 (March 30, 2021): 6–22. http://dx.doi.org/10.33137/jns.v2i1.34660.
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Handedness is the most studied human asymmetry due to its connection to various lateralized behaviours and hence many studies have focused on developing a valid assessment. One of the most popular is the Edinburgh Handedness Inventory (EHI), however, its psychometric properties have been questioned and due to its complex response format, various modified versions of EHI are in use. One of them is a 7-item questionnaire produced by Dragovic and Milenkovic (2013), which seeks to reduce a potentially continuous variable to a categorical one by clearly classifying people as right- or left- handed. The purpose of this study was to develop a questionnaire to more accurately quantify mixed-handedness as a continuous variable, and to investigate the correlation between Dragovic’s modified 7-item EHI, new items created for this study, and three performance measures (grooved pegboard, finger-tapping and grip strength/dynamometer). A total of 113 self-reported right-, left- and mixed-handed participants were randomly recruited to complete the questionnaire and behavioural measures. The questionnaire data was submitted to exploratory factor analysis and resulting factor scores were examined for correlations with behavioural tests. Compared to the modified EHI, the questionnaire showed a more continuous grading of handedness. Moreover, the degree of handedness on the questionnaire showed a stronger correlation with all the performance measures than the performance measures had amongst themselves. These findings show that the novel questionnaire with modern-day items can provide an accurate estimate of the degree of mixed-handedness in both right- and left-handed individuals. Future studies should examine these measures on a larger sample of left-handed and ambidextrous people, who tend to be more variable than right-handers in their usage. The questionnaire can also be suitable for studying the relationship between variable handedness and other aspects of brain lateralization.
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Weber, Johanna. "ARE THERE CONNECTIONS BETWEEN HANDEDNESS, COMPETITIVE RESULTS AND MOTIVATION IN WHEEL GYMNASTS?" Science of Gymnastics Journal 14, no. 1 (February 27, 2022): 107–17. http://dx.doi.org/10.52165/sgj.14.1.107-117.
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Handedness is a performance-influencing factor in many competitive sports. In female team handball, psychological factors such as motivation have been connected to handedness. It should be researched whether this is also the case in wheel gymnastics and whether motivation is related to performance or handedness. For this purpose, 203 German wheel gymnasts were studied. There are significant differences in motivational aspects between gymnasts of different handedness within the straight line discipline. No differences were found in the all-around. There were not enough cases of gymnasts competing in spiral or vault only. When comparing the prevalence of different types of handedness in the general population to those among wheel gymnasts, no specific evaluation could be conducted for male gymnasts due to too few cases, although it should be noted that all 13 male participants were right-handed. When comparing the percentages of the left-handed and ambidextrous among female gymnasts to those in the general female population, it is evident that there is a higher percentage of ambidexters and left-handers among wheel gymnasts than in the general female population. There are differences in the percentages of female gymnasts of different handedness competing in straight line and all-around. There are correlations between percentage of handedness and competitive results when considering quintiles of competitive results (e. g. r = 0.949 and p ≤ 0.014 for technical difficulty in left-handed athletes). Our results suggest that it might be necessary to consider handedness when it comes to individual coaching and selection.
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Grga, Djurica, and Vesna Miletic. "Dental education of left-handed students." Serbian Dental Journal 53, no. 2 (2006): 138–43. http://dx.doi.org/10.2298/sgs0602138g.
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Introduction: Asymmetrical activity of brain hemispheres is projected through laterality e.g. the dominance of one of the paired organs. A very important way of laterality manifestation is left-handedness. The lef-handed must solve various conflicts with their environment, so mild left-handedness usually shifts into dominant right-handedness in the early childhood, fortunately with no difficulties. Aim: The purpose of this study was to determine the number and distribution of left-handed dental students, check the possibilities and propose measures for solving the problem in their education. Material and methods: The study was conducted at Belgrade University School of Dentistry, dept. of restorative dentistry and endodontics. During two academic years, six generations of senior dental students (III, IV and V year students) completed a questionnaire, i.e. 1385 individuals were included in the survey. Results: The questionnaire revealed that out of the total number or students involved in the study 62 (4.48%) students were left-handed. The distribution of left-handed students is relatively uniform and concentrated between 4-6% of the sample. Conclusion: Even though the number of left-handed students is small, it is necessary to change conditions for their education and enable their proper development.
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Dietl, Gregory P., and Jonathan R. Hendricks. "Crab scars reveal survival advantage of left-handed snails." Biology Letters 2, no. 3 (March 21, 2006): 439–42. http://dx.doi.org/10.1098/rsbl.2006.0465.
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Biological asymmetries are important elements of the structure and function of many living organisms. Using the Plio–Pleistocene fossil record of crab predation on morphologically similar pairs of right- and left-handed snail species, we show here for the first time, contrary to traditional wisdom, that rare left-handed coiling promotes survival from attacks by right-handed crabs. This frequency-dependent result influences the balance of selection processes that maintain left-handedness at the species level and parallels some social interactions in human cultures, such as sports that involve dual contests between opponents of opposite handedness.
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Corballis, Michael C., John Hattie, and Richard Fletcher. "Handedness and intellectual achievement: An even-handed look." Neuropsychologia 46, no. 1 (January 2008): 374–78. http://dx.doi.org/10.1016/j.neuropsychologia.2007.09.009.
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Dane, Şenol, and Mehmet Ali Şekertekin. "Differences in Handedness and Scores of Aggressiveness and Interpersonal Relations of Soccer Players." Perceptual and Motor Skills 100, no. 3 (June 2005): 743–46. http://dx.doi.org/10.2466/pms.100.3.743-746.
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Handedness and differences in interpersonal relations and aggressiveness were studied in 33 right-handed ( M age = 22.9 yr., SD = 4.9) and 18 left-handed ( M age = 22.5 yr., SD = 2.4) male soccer players who played actively in professional soccer leagues of Turkey. Hand preference on the Edinburgh Handedness Inventory and scores for destructiveness, assertiveness, and passive aggressiveness on a Turkish Aggressiveness Inventory, plus scores for sociability, benevolence, tenderheartedness, tolerance, and insistence on the Turkish Interpersonal Relations Inventory were examined. Mean destructive aggressiveness was higher for the left- than the right-handed athletes. Means on tolerance and insistence were higher for the right- than the left-handed athletes. Higher aggressiveness and less tolerance and insistence in the left-handers may be associated with their higher sports performance.
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Cvetkovic, Milena, and Perica Vasiljevic. "Handedness and phenotypic characteristics of the head and face." Genetika 47, no. 2 (2015): 723–31. http://dx.doi.org/10.2298/gensr1502723c.
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Craniofacial characteristics are used to identify similarities and differences between human populations or within a single population. The aim of this study is to provide data on the differences/similarities between two groups of subjects, left-handed and right-handed children, based on the parameters that determine the phenotypic characteristics of the head and face: head dimensions, face dimensions, hair color, eye color and earlobe shape. The study participants included 1354 students aged 7 to 15 years from regular schools of southeastern Serbia. The instruments used include: the Edinburgh Handedness Questionnaire for handedness determination, the cephalometer, and the questionnaire. 135 students (9.97%) were identified as left-handed, and the differences in the observed parameters were recorded between left-handed and right-handed girls in relation to the cephalic index, nasal index, head breadth, face breadth, and eye color.
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Putri, Vionita, Elda Irma Jeanne Joice Kawulur, Febriza Dwiranti, Sabarita Sinuraya, and Sita Ratnawati. "Hand Preference and Creativity of Papua University Student." Jurnal Penelitian Pendidikan IPA 8, no. 1 (January 16, 2022): 257–62. http://dx.doi.org/10.29303/jppipa.v8i1.914.
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Human has a preference to use their hands for various manual activities. Left-handed preference is people who tend to use their left hand to perform various manual activities, while right-handed people tend to use right-handed. Any researches show that the left-handed preference for more creativity was influenced by the dominant use of the right brain and bigger corpus callosum. The research aims to determine the percentage of left-handed preference and their creativity in Universitas Papua, Manokwari Papua Barat. The method used in this research is the descriptive method. Data collection used a questionnaire to evaluate individual hand preference using Handedness Questionnaire and to determine individual creativity using Adjective Check List. The percentage of left-handed people in UNIPA were 9.3% or lower than right-handed and higher than ambidextrous. Our study supports the statement about selection in handedness in the traditional society which showed a higher percentage of left-hander as advantages related to using hand intensively. The percentage of left-handed males and females was almost equal and strongly left-handed was higher in females. The percentage of creative people was higher in left-handed, especially in males
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Sarma, P. S. B. "Mixed-Handedness and Achievement Test Scores of Grade School Children." Perceptual and Motor Skills 68, no. 3 (June 1989): 839–46. http://dx.doi.org/10.2466/pms.1989.68.3.839.
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Normal Curve Equivalent Scores on subtests of the California Achievement Test for mixed-handed children, 52 boys and 58 girls from Grades 3 and 4, who are right- and left-handed writers, indicate no differences by handedness in girls, but among the mixed-handed fourth grade boys, those who wrote right-handed scored lower on Study Skills than the boys who wrote left-handed.
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Wijerathne, Buddhika TB, and Geetha K. Rathnayake. "Association between digital dermatoglyphics and handedness among Sinhalese in Sri Lanka." F1000Research 2 (April 18, 2013): 111. http://dx.doi.org/10.12688/f1000research.2-111.v1.
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BackgroundThe relationship between handedness and digital dermatoglyphic patterns has never been investigated in the Sinhalese population. The goal of this study is to establish the above mentioned relationship, which would positively aid personal identification. FindingsOne hundred Sinhalese students (50 right-handed and 50 left-handed) were studied for their digital dermatoglyphic pattern distribution. The results show that a statistically significant correlation exists for digit 3 (P=0.002, Fisher’s exact test) of the right hand and digit 1 (P=0.002, Fisher’s exact test) and digit 2 (P=0.021, Fisher’s exact test) of the left hand. Further, whorl patterns are more common in right-handed than left-handed Sinhalese students.Conclusions Statistically significant differences in handedness and digital dermatoglyphic patterns were evident among Sinhalese people. Further study with a larger sample size is recommended.
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Gordon, Nicole M., Thorsten Rudroff, Joel A. Enoka, and Roger M. Enoka. "Handedness but not dominance influences variability in endurance time for sustained, submaximal contractions." Journal of Neurophysiology 108, no. 5 (September 1, 2012): 1501–10. http://dx.doi.org/10.1152/jn.01144.2011.
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The purpose of this study was to compare endurance time and accompanying neuromuscular adjustments when left- and right-handed subjects used the dominant and nondominant arms to sustain submaximal contractions that required either force or position control. Ten left-handed and 10 right-handed healthy adults (21 ± 5 yr) participated in the study. Each subject exerted a similar net torque about the elbow joint during the force and position tasks to achieve a target force of 20% maximal voluntary contraction (MVC) force (56 ± 18 N). MVC force declined to a similar level immediately after task failure for left- and right-handed subjects (27 ± 13 vs. 25 ± 15%, P = 0.9). Endurance time for the position task was similar for the dominant and nondominant arms (task × dominance interaction, P = 0.17). Although the difference in endurance time between the two tasks was similar for left-handed (136 ± 165 s) and right-handed individuals (92 ± 73 s, task × handedness interaction, P = 0.38), there was greater variance in the ratio of the endurance times for the force and position tasks for left-handed (0.77) than right-handed subjects (0.13, P < 0.001; see Fig. 2 ). Furthermore, endurance time for the force and position tasks was significantly correlated for right-handed subjects ( r2 = 0.62, P < 0.001), but not for left-handed subjects ( r2 = 0.004, P = 0.79). Multiple regression analyses identified sets of predictor variables for each endurance time, and these differed with handedness and task. Hand dominance, however, did not influence endurance time for either group of subjects. These findings indicate that endurance times for the elbow flexors when performing submaximal isometric contractions that required either force or position control were not influenced by hand dominance but did depend on handedness.
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James, William H. "Handedness and Size." Perceptual and Motor Skills 80, no. 3_suppl (June 1995): 1250. http://dx.doi.org/10.2466/pms.1995.80.3c.1250.
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Since baseball pitchers are selected for height and left-handedness, nothing can validly be inferred about the general population from the fact that left-handed Major League pitchers are shorter than right-handed pitchers.
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Martin, Benjamin E. "Differences in proportional claw size among left- and right-handed Atlantic sand fiddler crabs Leptuca pugilator (Bosc, 1801) (Decapoda: Brachyura: Ocypodidae)." Journal of Crustacean Biology 39, no. 6 (September 26, 2019): 720–23. http://dx.doi.org/10.1093/jcbiol/ruz067.
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Abstract The sexually dimorphic, enlarged major claw is a prominent feature among fiddler crabs and acts as both a sexual signal and weapon. Most often the enlarged claw occurs on the left and right sides of fiddler crabs in relatively even proportions (40–60%), but populations exhibit an extreme right handedness bias (> 90%) in a few cases. The mechanisms maintaining relatively even handedness proportions among fiddler crabs remains debatable, but from an evolutionary perspective it should be maintained through an evenness in fitness (reproduction and survival) between left- and right-handed crabs. I investigated handedness ratios and claw to body size in a Leptuca pugilator (Bosc, 1801) population on Sapelo Island, Georgia, USA. In collecting 417 adult male crabs, there was a slight right-hand bias (54%, χ 2= 2.9376, P = 0.087), which was similar to the previous study of this population 17 years prior. I nevertheless found right-handed crabs had significantly smaller claw size relative to their carapace size (P = 0.018). Overall, this study documents inequality in the body proportions between left- and right-handed L. pugilator within a population operating at a slight right hand-bias. I discuss how my study contributes to previous discussions on handedness bias in fiddler crabs as well as potential mechanisms that control its widespread handedness evenness.
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J, Ryan, Kreiner D, Gontkovsky S, and Paolo A. "A-079 Hand Preference in Men and Women with Parkinson’s Disease: A Preliminary Investigation." Archives of Clinical Neuropsychology 35, no. 6 (August 28, 2020): 871. http://dx.doi.org/10.1093/arclin/acaa068.079.
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Abstract Objective Research has identified common genetic influences on handedness and neurological/mental health phenotypes. It also has been shown there may be increased risk for development of neurological disorders/diseases among individuals naturally left-handed or demonstrating non-right-hand preference. This investigation examined prevalence of right-handed versus non-right-handed individuals with Parkinson’s disease (PD) compared to controls. Method Participants were 264 patients with PD (mean age = 69.83 years) and 256 control volunteers (mean age = 71.42 years). Mean Dementia Rating Scale composites for the groups were 123.68 and 136.00, respectively. Participants self-identified their dominant hand for writing and usage was confirmed during the session. Results Proportions of non-right- and right-handed controls (7.0% and 93.0%) versus individuals with PD (6.8% and 93.2%) did not differ. Changes in proportions of non-right- and right-handedness across age ranges were not significant for controls or patients. There was a trend for a larger proportion of women (55.9%) versus men among controls (44.1%), □ 2 (1) = 3.29, p < .10; whereas, the proportion of men (64.4%) with PD was larger than that of women. (35.6%), □ 2 (1) = 21.31, p < .001. For controls and patients, non-right and right handedness gender proportions were similar. Conclusions This study is the first to assess handedness prevalence rates in PD. Results suggest prevalence of non-right handedness is similar in PD and healthy individuals and does not appear to differ markedly by gender or with advancing age. The occurrence of a trend for a larger proportion of women than men among controls is consistent with census-based statistics.
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Milenkovic, Sanja, Milica Brkic, and Goran Belojevic. "Left-handedness and neurotic disturbances in adult urban population." Srpski arhiv za celokupno lekarstvo 141, no. 11-12 (2013): 785–88. http://dx.doi.org/10.2298/sarh1312785m.
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Introduction. Controversial results on the relationship between the left-handedness and neurotic disturbances have been obtained in so far investigations. Objective. The aim of this study was to investigate the link between the left-handedness and neurotic disturbances in an adult urban population. Methods. A cross-sectional study was performed on 1,202 adult residents of the Stari Grad municipality in Belgrade, out of which 401 were males (33,4%) and 801 were females (66,6%). A questionnaire was used as an investigation instrument, with questions concerning age, gender, writing hand and neurotic disturbances: tension, agressiveness, anger, nervousness, weepiness and seclusion. Results. Left-handedness was found in 60 subjects (5%) and it was statistically more frequent in males (7.7%) compared to females (3.6%) (p=0.003). A decreasing trend of proportion of left-handed males was found in relation to aging. In the age group 18 to 39 years, agressiveness, as a specific neurotic disturbance, was significantly more frequent in left-handed males in comparison to right-handers (p=0.035). In the age group 40 to 59 years, neurotic disturbances were more common among left-handed males compared to right-handers (p=0.030). There were no significant diferences in the proportion of neurotic disturbances between the left-handed and the right-handed females. Conclusion. From a public health point of view, left-handed men may be regarded as a relatively vulnerable population category concerning mental health.
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Camposano, Susana, and Fernando Lolas. "Effects of stimulation intensity, gender and handedness upon auditory evoked potentials." Arquivos de Neuro-Psiquiatria 50, no. 1 (March 1992): 43–49. http://dx.doi.org/10.1590/s0004-282x1992000100008.
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Left handers and women show less anatomical brain asymmetry, larger corpus callosum and more bilateral representation of specific functions. Sensory and cognitive components of cortical auditory evoked potentials (AEF) have been shown to be asymmetric in right handed males and to be influenced by stimulus intensity. In this study the influence of sex, handedness and stimulus intensity upon AEP components is investigated under basal conditions of passive attention. 14 right handed males, 14 right handed females, 14 left handed males, and 14 left handed females were studied while lying awake and paying passive attention to auditory stimulation (series of 100 binaural clicks, duration 1 msec, rate 1/sec, at four intensities). Cz, C3 and C4 referenced to linked mastoids and right EOG were recorded. Analysis time was 400 msec, average evoked potentials were based on 100 clicks. Stimulus intensity and gender affect early sensory components (P1N1 and N1P2) at central leads, asymmetry is influenced only by handedness, right handers showing larger P1N1 amplitudes over the right hemisphere.
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Van den Eynde, F., H. Broadbent, S. Guillaume, A. Claudino, I. C. Campbell, and U. Schmidt. "Handedness, repetitive transcranial magnetic stimulation and bulimic disorders." European Psychiatry 27, no. 4 (May 2012): 290–93. http://dx.doi.org/10.1016/j.eurpsy.2010.08.015.
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AbstractRepetitive Transcranial Magnetic Stimulation (rTMS) research in psychiatry mostly excludes left-handed participants. We recruited left-handed people with a bulimic disorder and found that stimulation of the left prefrontal cortex may result in different effects in left- and right-handed people. This highlights the importance of handedness and cortex lateralisation for rTMS.
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Reiß, Michael, and Gilfe Reiß. "Asymmetry of the Stepping Test." Perceptual and Motor Skills 85, no. 1 (August 1997): 305–6. http://dx.doi.org/10.2466/pms.1997.85.1.305.
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The influence of handedness on a measure of the vestibulospinal response was investigated with 25 right-handed and 25 left-handed subjects to examine the asymmetry of the stepping test. Right-handed subjects showed dominance of the right side indicated by direction of movement, but left-handed subjects tended much less to the left side so a functional asymmetry is for left-handers somewhat less clearly expressed.
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Loprinzi, Franklin, Farris, and Ryu. "Handedness, Grip Strength, and Memory Function: Considerations by Biological Sex." Medicina 55, no. 8 (August 6, 2019): 444. http://dx.doi.org/10.3390/medicina55080444.
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Background and Objective: The objective of this study was to evaluate the potential independent and interactive effects of handedness and grip strength on episodic memory function, and whether biological sex moderated these relationships. Materials and Methods: 162 young adults (Mage = 20.7 years) completed a series of memory assessments including a subjective memory complaint evaluation and several objective measures of memory. Handedness (i.e., left-hand dominant, inconsistent handedness (ICH), and right-hand dominant) was evaluated using the Edinburgh Handedness Inventory. Handgrip strength was determined from a handgrip dynamometer. Results: When compared to ICH individuals, retrospective memory scores were statistically significantly worse for left-handed (p = 0.02) and right-handed (p = 0.03) individuals. Higher grip strength was statistically significantly associated with fewer retrospective memory complaints (b = 0.10, 95% CI: 0.01, 0.19, p = 0.04). Conclusions: The present study provides some suggestive evidence that ICH (inconsistent handedness) and greater grip strength are associated with fewer retrospective memory complaints. However, we did not observe any evidence of an interaction effect of handedness and grip strength on memory, and similarly, biological sex did not interact with these parameters to influence memory.
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Coren, Stanley. "Measurement of Handedness via Self-Report: The Relationship between Brief and Extended Inventories." Perceptual and Motor Skills 76, no. 3 (June 1993): 1035–42. http://dx.doi.org/10.2466/pms.1993.76.3.1035.
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Three self-report measures of handedness were explored. For simple dichotomous classification into right- versus left-handed groups, a brief (4-item) and an extended (12-item) inventory produced 98.8% classification concordance in a sample of 250 subjects. When handedness was treated as a continuous variable, indexes based upon the short and expanded scales correlated highly ( r = 0.95). A single-item handedness measure was also created which produced handedness classifications which were better than 97% concordant with the brief and extended handedness scales for dichotomous classification. The methodological implications of these findings for handedness measurement are discussed.
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Oyebode, Femi, and Kenneth Davison. "Handedness and Epileptic Schizophrenia." British Journal of Psychiatry 156, no. 2 (February 1990): 228–30. http://dx.doi.org/10.1192/bjp.156.2.228.
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Thirty-two epileptic patients with RDC diagnoses of schizophrenia were tested for handedness on the Annett Handedness Schedule, and handedness was assigned on the basis of Annett–Maudsley criteria. They were compared with three other groups of patients. Five (15.6%) of the epileptic schizophrenic patients were mixed or left handed. The prevalence of mixed and left handedness did not differ between the samples studied. However, there was a significant reduction of mixed and left handedness in male epileptics with schizophrenia. Mixed or left handedness in male epileptics appears to be protective against the development of psychiatric illness in general.
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Al-Hashel, Jasem Y., Samar Farouk Ahmed, Hanouf Al-Mutairi, Shahd Hassan, Nora Al-Awadhi, and Mariam Al-Saraji. "Association of Cognitive Abilities and Brain Lateralization among Primary School Children in Kuwait." Neuroscience Journal 2016 (May 26, 2016): 1–5. http://dx.doi.org/10.1155/2016/6740267.
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Background. Many studies have explored the cognitive variation between left- and right-handed individuals; however, the differences remain poorly understood. Aim of the Work. To assess the association between brain lateralization indicated by handedness and cognitive abilities. Material and Methods. A total of 217 students aged between 7 and 10 years of both genders were identified for the study. Males and females were equally distributed. All left-handed students were chosen. An equal group with right-handed students was randomly selected. Handedness was assessed using traditional writing hand approach as well as the WatHand Cabient Test and the Grooved Pegboard Test. Cognition was measured using Cambridge University’s CANTAB eclipse cognitive battery. Pearson Correlation Coefficient Test “r” was calculated to measure the strength of association between quantitative data. Results. Right-handed children had superior visuospatial abilities (p=0.011, r=0.253), visual memory (p=0.034, r=0.205), and better scores in reaction time tests which incorporated elements of visual memory (p=0.004, r=-0.271). Left-handed children proved to have better simple reaction times (p=0.036, r=0.201). Conclusion. Right-handed children had superior visuospatial abilities and left-handed children have better simple reaction times.
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Merenkova, Vera Sergeevna, and Angelica Nikolaevna Pronina. "Specific features of inhibition processes in junior schoolchildren with the handedness of the different type." LAPLAGE EM REVISTA 7, no. 3 (August 11, 2021): 272–82. http://dx.doi.org/10.24115/s2446-62202021731295p.272-282.
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Within the present paper, we attempted to study specific features of inhibitory control in junior schoolchildren with the handedness of the different types. assessment of inhibitory control was fulfilled with the help of the method of recurrent biological feedback. The assessment of the type of handedness was performed through the set of tasks. resistance of inhibitory processes and stress resistance were identified in the right-handed children compared to the left-handed and mixed-handed children. This study might be useful in the area of psychophysiology of individual differences in children. Despite the abundance of literature on the study of executive functions, there is still no understanding of how inhibitory processes develop in the ontogenesis of children with different lateral preferences.
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Aadhyyanth R Allu and Sudakshina Chakrabarti. "Fingerprint patterns of thumb and index in the right and left-handed male and female medical and paramedical students." International Journal of Research in Pharmaceutical Sciences 11, SPL2 (April 17, 2020): 64–70. http://dx.doi.org/10.26452/ijrps.v11ispl2.2113.
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Dermatoglyphics is the scientific study of the epidermal ridge configuration of hands and feet. Digital dermatoglyphics are unique and specific evidence that greatly contribute to personal identification in forensic science. Hand dominance is an uneven distribution of fine motor skills between the left and right hands. The objective of the study is to observe gender variation in fingerprinting pattern of thumb and index fingers and also to determine the relationship between handedness and digital dermatoglyphics. The study was conducted at Saveetha Medical College and Hospital. Ethical clearance for this study was obtained from the Ethical Clearance Committee of the institute. This cross-sectional study was conducted on a sample size of 500 students, of 18-25 years of age, pursuing their education in the constituent courses of Saveetha Medical College. Handedness was assessed using the Edinburgh Handedness Inventory. The fingerprints were obtained by a 'Lipstick' method. The prints were studied using a magnifying lens. The various patterns of fingerprints were observed, categorized and compared according to standard guidelines. A total of 500 students were studied. There were 228 right-handed males, 18 left-handed males, 233 right-handed females and 21 left-handed females. In right-handed males, the thumb showed a predominance of loop pattern in (57.9 %) study participants and in right-handed females loop pattern was observed in thumb was 61.1%. In the right-handed female thumb, loops were predominant patterns in 70.8. Arch pattern is distinctively absent for both right and left-handed thumb in both males and females. 19.3 % of female right-hander had arch patterns predominantly in their index finger. Widespread interest is developing in the field of medicine and forensic science with regard to epidermal ridges. Our present study was able to observe gender variations and variations in the dermatoglyphic pattern in the right and left-hander for the first two digits.
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Graham, Charles J., Rhonda Dick, Vaughn I. Rickert, and Robert Glenn. "Left-handedness as a Risk Factor for Unintentional Injury in Children." Pediatrics 92, no. 6 (December 1, 1993): 823–26. http://dx.doi.org/10.1542/peds.92.6.823.
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Objective. To determine whether left-handedness is a risk factor for unintentional injury among children and adolescents. Design. Case-control study. Setting. Pediatric emergency department of Arkansas Children's Hospital. Patients. 265 patients sustaining unintentional trauma aged 6 to 18 years and 494 control patients who did not have trauma were given a questionnaire to determine handedness, past unintentional injury, and parental perception of injury proneness. Results. The frequency of left-handedness in the trauma group (18.1%) was significantly greater than frequency of 10.5% in the control group (P < .003, odds ratio = 1.80, 95% confidence interval 1.20 to 2.72). Multivariate analysis revealed handedness as the only significant vanable between trauma and control (P < .04). The proportion of left-handers who had been hospitalized previously for injury treatment (20.0%) was larger than the proportion of right-handers, (12.0%) (P < .026, odds ratio = 1.84, 95% confidence interval 1.03 to 3.27). More parents of left-handens rated their child as "more clumsy than average' than parents of right-handens (26.0% vs 15.2%, P < .007). Conclusions. Left-handedness appears to be a risk factor for unintentional injury in children and adolescents in a pediatric emergency department population.
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Martens, Marilee A., Sarah J. Wilson, Jian Chen, Amanda G. Wood, and David C. Reutens. "Handedness and corpus callosal morphology in Williams syndrome." Development and Psychopathology 25, no. 1 (February 2013): 253–60. http://dx.doi.org/10.1017/s0954579412001009.
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AbstractWilliams syndrome is a neurodevelopmental genetic disorder caused by a hemizygous deletion on chromosome 7q11.23, resulting in atypical brain structure and function, including abnormal morphology of the corpus callosum. An influence of handedness on the size of the corpus callosum has been observed in studies of typical individuals, but handedness has not been taken into account in studies of callosal morphology in Williams syndrome. We hypothesized that callosal area is smaller and the size of the splenium and isthmus is reduced in individuals with Williams syndrome compared to healthy controls, and examined age, sex, and handedness effects on corpus callosal area. Structural magnetic resonance imaging scans were obtained on 25 individuals with Williams syndrome (18 right-handed, 7 left-handed) and 25 matched controls. We found that callosal thickness was significantly reduced in the splenium of Williams syndrome individuals compared to controls. We also found novel evidence that the callosal area was smaller in left-handed participants with Williams syndrome than their right-handed counterparts, with opposite findings observed in the control group. This novel finding may be associated with LIM-kinase hemizygosity, a characteristic of Williams syndrome. The findings may have significant clinical implications in future explorations of the Williams syndrome cognitive phenotype.
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Fritsche, Sarah A., and Annukka K. Lindell. "ON THE OTHER HAND: THE COSTS AND BENEFITS OF LEFT-HANDEDNESS." Acta Neuropsychologica 17, no. 1 (February 12, 2019): 69–86. http://dx.doi.org/10.5604/01.3001.0013.1689.
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Left-handers have been persecuted by right-handers for millennia. This right bias is evident cross-culturally, linguistically (right is literally and figuratively ‘right’, with lefties being described as ‘gauche’, ‘sinister’ and ‘cack-handed’), and environmentally (e.g., equipment design, including power tools, ticket machines, and lecture-room desks). Despite this, the proportion of left-handers has remained constant at approximately 10% of the hominid population, implying that though there are costs associated with left-handedness (if there were not, the proportions of left- and right-handers would be 50:50), left handers must also enjoy fitness advantages that maintain the genes for left-handedness in the population. This paper reviews the costs and benefits of being left-handed, exploring research examining the effects of handedness on brain structure, cognitive function, and human behaviour. The research confirms a variety of left-hander advantages, including some cognitive superiorities, higher wages, and greater sporting and fighting prowess. On the other hand, left-handedness is also associated with significant fitness costs, including an increased risk of accidents, higher substance abuse susceptibility, and earlier death, in comparison with right-handers. In sum, left-handedness confers both costs and benefits, with the latter outweighing the former, maintaining the genes for left-handedness in the population.
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Hicks, Robert A., Crystal Johnson, Tony Cuevas, Dolores Deharo, and Jose Bautista. "Do Right-Handers Live Longer? An Updated Assessment of Baseball Player Data." Perceptual and Motor Skills 78, no. 3_suppl (June 1994): 1243–47. http://dx.doi.org/10.2466/pms.1994.78.3c.1243.
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In support of the argument that left-handedness is a marker for decreased survival fitness, in 1991 Coren and Halpern gave considerable weight to the results of their 1988 study in which right-handed baseball players were described as having Lived about eight months longer than their left-handed peers. In their 1993 unsuccessful attempt to replicate this study, Fudin and colleagues cited certain difficulties with the sources of these data that led them to recommend a comprehensive third study which included only reliable data from the two current editions of the major sources of information on Major League baseball players, i.e., the 1993 editions of The Baseball Encyclopedia and Total Baseball. Following this suggestion, we measured the life spans of ail baseball players, i.e., right-, left-, and mixed-handed players, for whom reliable data were available ( N = 5441) and found that the relationship between handedness and longevity was not significant. Unlike Halpern and Coren we noted that right-handed players could be described as having lived about eight months less than their left-handed peers.
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Pennington, N., A. Redmond, T. Stewart, and M. Stone. "The impact of surgeon handedness in total hip replacement." Annals of The Royal College of Surgeons of England 96, no. 6 (September 2014): 437–41. http://dx.doi.org/10.1308/003588414x13946184902488.
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Introduction Total hip replacement (THR) is successful and performed commonly. Component placement is a determinant of outcome. Influence of surgeon handedness on component placement has not been considered previously. This study was a radiographic assessment of component positioning with respect to handedness. Early data from 160 patients are reported. Methods Overall, 160 primary THRs for osteoarthritis were included. Equal numbers of left and right THRs were performed by four surgeons, two right-handed and two left-handed. Postoperative radiography was assessed for THR component position by measurement of leg length inequality, acetabular inclination and centre of rotation. Surgeons’ handedness was assessed using the Edinburgh inventory. Results For leg length inequality, no significant interaction was seen between hip side and surgeon handedness. Acetabular inclination angles showed a statistically significant difference, however, depending on hand dominance, with higher inclination angles recorded when operating on the dominant side. There was a trend towards greater medialisation of the centre of rotation on the non-dominant side although this did not reach statistical significance. Conclusions Surgeon handedness appears to influence acetabular component position during THR but it is one factor of many that interact to achieve a successful outcome.
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Milenkovic, Sanja, Goran Belojevic, and Radojka Kocijancic. "Aetiological factors in left-handedness." Srpski arhiv za celokupno lekarstvo 133, no. 11-12 (2005): 532–34. http://dx.doi.org/10.2298/sarh0512532m.
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Lateralisation associates the extremities and senses of one side of the body, which are connected by afferent and efferent pathways, with the primary motor and sensory areas of the hemisphere on the opposite side. Dominant laterality denotes the appearance of a dominant extremity or sense in the performance of complex psychomotor activities. Laterality is manifested both as right-handedness or left-handedness, which are functionally equivalent and symmetrical in the performance of activities. Right-handedness is significantly more common than left-handedness. Genetic theory is most widely accepted in explaining the onset of lateralisation. According to this theory, the models of brain organisation asymmetry (anatomical, functional, and biochemical) are strongly, genetically determined. However, the inability to clearly demonstrate the association between genetic factors and left-handedness has led researchers to investigate the effects of the environment on left-handedness. Of particular interest are the intrauterine environment and the factors influencing foetal development, of which hormones and ultrasound exposure are the most significant. It has been estimated that an extra five cases of nonright-handed lateralisation can be expected in every 100 males who were exposed to ultrasound in utero compared to those who were not. Socio-cultural pressure on left-handed individuals was much more severe in the past, which is confirmed by scientific findings that left-handedness is present in 13% of individuals in their twenties, while in less than 1% of individuals in their eighties.
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Hicks, Robert A., Karen Pass, Hope Freeman, Jose Bautista, and Crystal Johnson. "Handedness and Accidents with Injury." Perceptual and Motor Skills 77, no. 3_suppl (December 1993): 1119–22. http://dx.doi.org/10.2466/pms.1993.77.3f.1119.
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As evidence for the hypothesis on the claim of reduced longevity for left-handers, Coren in 1989 reported data which suggested that left-handers were 1.89 times more likely to report injuries which required medical attention. This left-handed group included both left- and mixed-handed individuals. To clarify the results of his study, we repeated in part Coren's study but defined handedness so that groups of right-, mixed-, and left-handed individuals were considered. In contrast to Coren's data, we found that right- and left-handers did not differ significantly in the frequency with which they reported having experienced accidents with injury and that mixed-handers reported being significantly more likely to have had an injury-accident than either right- or left-handers. These data underscore the need to consider mixed-handedness as a separate group in studies of this type.
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Qo‘ldoshev, Avezmurodovich Rustambek. "“PSYCHOLOGICAL ASPECTS OF LEFT-HANDEDNESS: CONCEPT, CAUSES, AND PECULIARITIES”." Psychology and Education Journal 58, no. 1 (January 20, 2021): 4981–88. http://dx.doi.org/10.17762/pae.v58i1.1719.
Full textAbstract:
Left-handed is a characteristic of individual typological features of a person. At the present stage of society, solving a number of psychological problems in the traditional educational process, it is important to investigate psychophysiological peculiarities and specificity of causes of the laterality pattern’s formation in junior schoolchildren. Children with a left-sided profile are not a homogeneous group. Among the causes of left-handedness are the following: heredity or genetic left-handedness (as an individual congenital characteristic), pathological or compensatory (as a result of the compensation mechanism), forced or acquired (as a result of injury to the right hand or retraining). Recent studies describe how left-handers differ greatly from right-handed schoolchildren in their mental development, world’s perception, prevailing thinking strategies and specificity of emotional-affective expression. The reasons for this are manifold. However, the key factor is the inextricable and intimate connection of the left-handedness and the hemispheric dominance that leads to a specific functional organization, of the brain work. This means that the left-handed brain works and complies by some other rules in comparison with right-handed people. As a result they have some educational peculiarities and difficulties. In most cases, these children have difficulties in mastering oral and written language skills, numeracy and mathematical operations. A characteristic feature of left-handers is the insufficient and specific development of visual perception, which normally creates the basis for mastering reading and writing. Unfortunately children with left handedness do not receive adequate assistance in school, since education and upbringing are focused on right handed people. It is also shown that «traditional» retraining in early childhood can lead to distress, which has a negative impact on the children. Therefore, it is necessary to include in the educational process special methods and techniques. Thus it will be a favorable condition for their harmonious personal and intellectual development and effective mastering of various modules of the school curriculum. This article presents a theoretical model analysis of the causes and consequences of the development of sinistrality, briefly considered the psychological characteristics of left-handed children.