Dissertations / Theses: 'Handedness'

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Ivanova, D., Оксана Робертівна Гладченко, Оксана Робертовна Гладченко, and Oksana Robertivna Hladchenko. "Left- handedness versus right-handedness." Thesis, Sumy State University, 2020. https://essuir.sumdu.edu.ua/handle/123456789/77983.

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I am left-handed. I always wonder why people who write with their right hands react so violently seeing me operating with my left hand and often ask such questions as "How do you do this?", "Do you feel comfortable?" So I want to figure out how left-handed children differ from children who write with their right hand.

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Berahzer, Damien M. "Scroll Placement and Handedness." Thesis, School of Information and Library Science, 2005. http://hdl.handle.net/1901/165.

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This study explored how individuals categorized on handedness (being left or right hand dominant) reacted to having the vertical scroll bar of a web browser relocated to the left side of the screen. The relocation of the vertical scroll bar served as an alternative to the relocation of the prominent left aligned main navigation menu for most websites. Fifteen participants were recruited for the study. Each participant interacted with two versions of a web site in a modified browser to complete a set of ten short tasks. Participants completed tasks by interacting with a traditional and non-traditional vertical browser alignment. Left and right-handed participants were determined to be strikingly different in operation. Vertical scroll relocation produced some interesting results and responses.

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Gosch, Austin. "Handedness & Autobiographical Memory: An Examination of Handedness and its Effects on Autobiographical Memory." Scholarship @ Claremont, 2018. http://scholarship.claremont.edu/cmc_theses/1837.

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Previous research has shown that individuals who are inconsistently handed (IH) outperform consistently handed (IH) individuals on episodic and spatial memory tasks as well as many others. This current study examines whether handedness is related to a person’s ability to recall autobiographical memories (AM) - episodic memories about oneself. Participants were first asked to recall seven memories that will be cued by seven cue words: earth, friend, dream, power, love, trouble, and opinion. They later expanded on those memories to include more detail, then self-rated how well they were able to remember them on five aspects of AM (spatial layout, content, reliving, vividness, and belief) using a modified version of the Autobiographical Memory Questionnaire (AMQ). Ninety-seven participants (44.3% female, Age: 19 to 69 years) were included in the data analysis. All ninety-seven were recruited through Amazon’s Mechanical Turk system and were financially compensated for their time. Results showed no main effect of handedness on AM in regards to all five AM aspects tested, meaning IH’s did not outperform CH’s in regards to autobiographical memory recall.

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Ryan-Morgan, T. H. "Handedness, language and cerebral laterality." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638732.

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This thesis concerns itself with the study of lateral preference and performance behaviours for the functions of handedness and language. The research reported in this thesis addresses the measure and expression of handedness, in the light of current theory and practice; it explores the possibility of differences between left and right handers; it discusses evidence for the existence of a functional relationship between handedness and language; it reports on the expression of language processes within a normal subject population and it reviews the application and interpretations of commonly used methodologies. The results of experiments reported in this body of research are placed within the theoretical framework which has been constructed, in the literature, for the purpose of understanding human cerebral laterality.

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Magliaro, Joseph. "Handedness, performance and related sex differences /." Title page, contents and abstract only, 1986. http://web4.library.adelaide.edu.au/theses/09ARPS/09arpsm194.pdf.

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6

Brandler, William M. "The genetics of handedness and dyslexia." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:e3b42dba-7077-4ab8-8eb7-14cd198b5a87.

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The population level bias towards right-handedness in humans implies left-hemisphere dominance for fine motor control. Left-handedness and reduced cerebral asymmetry have been linked to neurodevelopmental disorders such as dyslexia. Understanding the biology of these traits at a genetic level is crucial for understanding the relationship between handedness and neurodevelopmental disorders. Here I present genome-wide association study (GWAS) meta-analyses for both relative hand skill (handedness, n = 728) and reading-related traits (n = 548) in individuals with dyslexia. I uncovered a genome-wide significant association in an intron of PCSK6 associated with relative hand skill. PCSK6 is a protease that cleaves NODAL proprotein into an active form, and NODAL determines the development of left/right (LR) asymmetry in bilaterians. I performed pathway analyses of the GWAS data that revealed handedness is determined in part by the mechanisms that establish left/right (LR) asymmetry early in development, such as NODAL signalling and ciliogenesis. This finding replicated in a general population cohort unaffected with neurodevelopmental disorders (n = 2,666). A key stage in LR asymmetry development is the rotation of cilia that creates a leftward flow of NODAL. Candidate genes for dyslexia are involved in both neuronal migration and ciliogenesis. Ciliopathies can cause not only LR body asymmetry phenotypes, but also cerebral midline phenotypes such as an absent corpus callosum. Furthermore, I identified a genome-wide significant association with non-word reading located in an intron of MAP1B, a gene involved in neuronal migration that causes an absent corpus callosum when disrupted in mice. However, this finding did not replicate in two independent cohorts with dyslexia (n = 156 & 199), or in the general population cohort (n = 2,359). Though these cohorts had inadequate reading measures and poorly matched ascertainment for dyslexia. I also performed copy number variation (CNV) pathway and burden analyses of 920 individuals with dyslexia and 1,366 unselected controls, but did not find that rare CNVs play a major role in the etiology of dyslexia. Based on these results I propose that common variants in genes responsible for ciliogenesis and corpus callosum development influence traits such as handedness and reading ability.

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Kynaston, Callum. "Marginal intelligence difference between handedness groups." Thesis, Umeå universitet, Institutionen för psykologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172691.

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Whether the hand you write with has any impact or says anything about you has been debated for hundreds of years. The most cited in the media today is an association between left-handedness and creativity. However, handedness has also been associated with intelligence, with a small advantage for those being right-handed, according to a systematic review. The present study compared intelligence, measured by the Wiener Matrizen Test, across groups who self-reported writing always with the right, always with the left, or sometimes with the left and sometimes with the right hand (ambidextrous), in a sample of 8,399 Swedish adults. The right-handed group had higher intelligence than both left-handed and ambidextrous groups, with an effect size for the right-left difference of 0.18 for males and 0.08 for females. Although of little consequence for any individual, such effects may have practical consequences at the group level, and should therefore be taken into account when comparing groups across demographic categories. Left-handedness is, for example, 23% more common among males than among females.
Huruvida den hand du skriver med har någon betydelse eller säger något om dig har debatterats i hundratals år. Mest citerat i media idag är en association mellan vänsterhänthet och kreativitet. Hänthet har också associerats med intelligens, med en liten fördel för högerhänta, enligt en systematisk litteraturgenomgång. Föreliggande studie jämförde intelligens, mätt med Wiener Matrizen Test, över grupper som själv-rapporterat att alltid skriva med höger, alltid med vänster, eller ibland med höger och ibland med vänster hand (ambidexter), i ett sampel med 8.399 vuxna svenskar. Gruppen med högerhänta hade högre intelligens än både vänsterhänta och ambidextra, med en effektstorlek för skillnaden mellan höger och vänster på 0,18 för mänoch 0,08 för kvinnor. Även om sådana effekter har liten betydelse för individen kan de ha praktiska konsekvenser på gruppnivå, och bör därför beaktas när man jämför grupper med olika demografiska kategorier. Vänsterhänthet är till exempel 23% vanligare bland män än bland kvinnor.

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8

Lifson, Steven A. "Neuroanatomical Asymmetry, Handedness, and Family History of Handedness : A Study of the Markers of Structural and Functional Lateralization." DigitalCommons@USU, 1989. https://digitalcommons.usu.edu/etd/5987.

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This study investigated the associations between (1) handedness (demonstrated preference of one hand for the performance of most unimanual tasks) and neuroanatomical asymmetry (measurable differences in width between the cerebral hemispheres) and (2) familial history of handedness (the presence of a left-handed sibling or parent of a right-handed subject) as an intervening factor in the relation between handedness and neuroanatomical asymmetry. Width measurements of the brain were derived from computerized tomographic ( CT) films and grouped in to categories by hand preference (measured by the Edinburgh Handedness Inventory) and family history. The measurements of right (n=68), right with left-· handed relatives (n=24), and left-handed (n=16) groups were then compared by width and other transformations of the brain measurements. Subjects were adults of both sexes who had been referred for neurologic examination and were diagnosed as free of major distorting brain pathology. Hemispheric widths were compared by group, as ratios (left÷right) and as differences (left-right). Analysis of variance revealed significant differences between right-hemisphere widths at three percentages of brain length in the posterior occipital and temporal-parietal portion of the right hemisphere. The two right-handed groups had significantly smaller right-hemisphere measurements than the left group at 80% (p=.03), 75% (p= .012), and 60% (p= .029) of brain length. There were no significant left-hemisphere differences between the groups. In terms of ratios of sides and differences between sides in the same brain region, the left - handed group was different from the right-handed group at the p Handedness appears to be moderately associated with neuroanatomical asymmetry. The differences in sizes of brain structures and their relation to functionally lateralized abilities may shed light on the processes by which each hemisphere becomes specialized to perform specific tasks and other aspects of individual differences.

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Langan, Jeanne Marie. "Handedness and cortical plasticity in stroke rehabilitation /." view abstract or download file of text, 2006. http://proquest.umi.com/pqdweb?did=1188874021&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.

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Thesis (Ph. D.)--University of Oregon, 2006.
Typescript. Includes vita and abstract. Includes bibliographical references (leaves 124-134). Also available for download via the World Wide Web; free to University of Oregon users.

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Alony, Sari. "Aspects of handedness, cognitive and affective variables." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27868.pdf.

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Martínez, Daniel. "Sex and handedness effects on cognitive abilities." CSUSB ScholarWorks, 1987. https://scholarworks.lib.csusb.edu/etd-project/355.

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Dragovic, Milan. "Measurement, classification and conceptualisation of atypical handedness in schizophrenia." University of Western Australia. School of Psychiatry and Clinical Neurosciences, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0071.

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[Truncated abstract] Atypical handedness is found to be more prevalent in schizophrenia patients than in psychiatric and normal controls, suggesting atypical brain lateralisation, particularly of regions associated with language. This ‘behavioural aberration’ is commonly considered as a marker of disturbed neurodevelopment, which is usually indexed by minor physical abnormalities. A prevailing view in the literature is that the atypical lateralisation of hand preference provides an additional index for the neurodevelopmental hypothesis of schizophrenia. Consistent with this hypothesis, an atypical lateralisation of hand preferences can also be considered as a consequence of environmental agents that might have interfered with early embryonic development. Notwithstanding the above, an atypical lateralisation of hand preferences can occur as a result of genetic factors as well as an interaction between genetic and environmental factors. The overall objective of this thesis was to advance existing knowledge on atypical laterality in schizophrenia by addressing its various (though related) aspects, including measurement, classification and conceptualisation. Atypical lateralisation of hand preferences in schizophrenia patients was approached by five separate studies. ... Overall, this thesis argues that the causes of atypical lateralisation of hand preferences are due to combined genetic and environmental factors and that its use as a marker of vulnerability to schizophrenia is limited. A cautious interpretation of various associations between the laterality and other measures, particularly cognitive measures, is advised until a broad agreement on the true nature of handedness is reached.

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Cyhlarova, Eva. "Schizotypy in children : associations with handedness and cognitive ability." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418810.

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Shek, Wing-yi, and 石詠儀. "Research into handedness and language dominance in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45161872.

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Miller, Nancy S. "Left-Handedness: Are Some Teaching Styles Inhibiting their Learning?" Defiance College / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=def1281624303.

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Wilcox, Gary A. (Gary Alden). "Handedness, Perceptual and Short Term Memory Asymmetries, and Personality." Thesis, North Texas State University, 1985. https://digital.library.unt.edu/ark:/67531/metadc331119/.

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A large body of research has depicted relative arousal of the left and right cerebral hemispheres as related to utilization of particular defensive coping styles, level of anxiety, and perceptual styles. The right and left hemispheres are also presented in the literature as differing in visual-spatial and verbal-auditory short term memory abilities. The present research studied 127 right handed undergraduates' relative performance on forward spatial and digits memory spans in relation to hemispheric lateralization and other perceptual and personality variables hypothesized in the literature to be related to hemispheric arousal. It was hypothesized that the forward spatial and digit memory spans would display asymmetrical sensitivity to hemispheric arousal. That is, in a series of successive factor analyses, a hemispheric balance factor, a trait anxiety factor, and a short term memory factor would emerge. The three factors were hypothesized to be unrelated to each other. During an initial group pretesting, subjects were given pencil and paper measures of handedness, trait anxiety, and several defensive coping styles. During a second individual testing, subjects were administered measures of short term memory, field independence, and a computerized presentation of geometric designs which measured the subjects ability to detect differences which occurred at either the global or analytic level (Navon task). The factor analyses revealed only the hypothesized trait anxiety factor. The hypothesized short term memory and hemispheric balance of arousal factors did not emerge. Instead, a. defensive coping style factor and separate verbal—auditory and visual-spatial short term memory factors emerged. Several methodological difficulties of the present study which possibly contributed to the failure of the two hypothesized factors to emerge were discussed. Several additional findings, including sex differences in hemispheric lateralization, were presented. Also, signal detection analysis revealed a pattern such that trait anxious subjects were biased toward over-reporting differences on the Navon task. Implications for further research were presented.

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Czuzak, Maria Helen 1964. "Skeletal asymmetry, degenerative joint disease and handedness in humans." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282640.

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Skeletal asymmetry is assessed by gross osteometry, combined cortical thickness, joint surface area and osteoarthritis score and compared to the reported handedness for 39 individuals. Based on the principles of bone remodeling there is a tacit assumption in the field of anthropology that handedness is the sole source of skeletal asymmetry and thus is predictable from the asymmetric pattern. In general, bone does hypertrophy in response to increased loading and atrophies when loads are chronically diminished. This study demonstrates that handedness is an ambiguous cultural construct and is nor the only contributor to skeletal asymmetry. Individuals exhibit a mosaic of asymmetry between the right and left sides for different measures. The features ranged from zero to 48.0% for the expression of asymmetry in a direction contrary to that expected by the principles of bone remodeling and the reported hand preference. The greatest percent of misclassification occurs for non-right-handed individuals and females. There is a greater frequency of misclassification for measures that reflect function (cortical thickness, joint surface area and osteoarthritis) compared to those that are subject to functional influences only during the growth and development of the individual (gross osteometry). These results indicate that the non-dominant limb is subject to activities heavy enough to stimulate bone remodeling but not dynamic enough to be classified as 'handedness'. Based on this sample skeletal asymmetry is not a reliable, definitive marker for hand preference.

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Hoso, Masaki. "Handedness coevolution : predator-prey interaction drives speciation in snails." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/136933.

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Butler, Michael. "The effects of depth processing and handedness on episodic memory /." Connect to Online Resource-OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1177948630.

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Thesis (M.A.)--University of Toledo, 2007.
Typescript. "Submitted as partial fulfillment of the requirements for the Master of Arts in Psychology." "A thesis entitled"--at head of title. Bibliography: leaves 20-22.

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Shore, Robert. "A functional characterisation of the PCSK6 locus associated with handedness." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/15719.

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Humans display a 90% population level bias towards right-handedness, implying the vast majority of people have a left-hemisphere dominant for motor control. Although handedness presents a weak, but very consistent heritability across the literature (estimated to be approximately 25%), to date few genetic loci associated with this complex trait have been identified and replicated in subsequent studies. One such gene which has been found to be associated with handedness and subsequently replicated is PCSK6, most recently through a quantitative GWAS (P < 0.5*10−8, Brandler et al. (2013)). Interestingly, PCSK6 is known to activate Nodal, a morphogen involved in a highly conserved bilaterian pathway known to regulate left-right body axis determination. Here I present the first molecular characterisation of a handedness-associated region by conducting a detailed functional analysis of the PCSK6 locus, combining genetic analysis, in silico prediction and molecular assays to investigate how common genetic variants influence handedness-related phenotypes. Specifically, I defined the associated locus to be 12.7 kb in size, spanning a predicted 1.8 kb bidirectional promoter which controls the expression of both an antisense long non-coding RNA (lncRNA), and a novel short PCSK6 isoform. A series of luciferase-expressing constructs were generated to characterise the promoter, identifying a minimal sequence capable of driving transcription in a sense strand direction. I have demonstrated experimentally that one of the top associated markers in previous GWA studies, rs11855145, directly creates/disrupts a suspected transcription factor bind site in the vicinity of this bidirectional promoter. Further functional studies of the genetic variation within PCSK6 may help explain the molecular regulatory mechanisms affecting gene expression. This project provides a model for assays to study other GWAS-nominated candidate genes, and in particular for establishing the role of noncoding variants. The findings from this study support the role of common variants in influencing complex phenotypes, such as handedness.

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Sullivan, Rachel A. "Handedness Is Not Linked to Locomotion in a Basal Anuran." Thesis, Southern Illinois University at Edwardsville, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10808549.

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Frogs exhibit a range of locomotor behaviors, which can be broadly grouped based upon limb movement patterns. Asynchronous behaviors are those that involve alternating limb movements and include crawling, climbing, burrowing, and asynchronous (trot) swimming. Synchronous behaviors are those that involve simultaneous limb movements and include jumping, lunge feeding, and synchronous (frog-kick) swimming. The degree of handedness (preferential limb use) in motor responses is thought to reflect functional lateralization of the brain, an indicator of neural complexity. Handedness has been examined across a range of anuran taxa and has been hypothesized to be related to a species’ preferred locomotor mode, with greater handedness predicted in species that make more extensive use of asynchronous locomotion. In contrast, it has been hypothesized that anuran handedness varies phylogenetically, with ambidexterity being the ancestral condition and handedness being derived. To date, research in this area has focused primarily on derived taxa and relatively little is known about basal taxa. The basal-most anuran family Leiopelmatidae is the sister group to all other frogs (Lalagobatrachia), and represents an excellent test of these competing hypotheses. Moreover, leiopelmatids rely exclusively on asynchronous swimming and likely exceed all other anuran taxa in their reliance on alternating limb movements during locomotion. We tested these competing hypotheses by examining handedness in two behaviors, righting response and trot-swimming, in the leiopelmatid Rocky Mountain Tailed Frog, Ascaphus montanus. Tailed Frogs showed no evidence of handedness despite the prevalence of asynchronous locomotion in their behavioral repertoire. The absence of handedness in a highly asynchronous basal anuran taxon, suggests that this phenomenon was not characteristic of the earliest frogs, but rather appeared later in the evolutionary history of the group.

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Mason, Alyssa M. Mason. "Do Handedness Differences in Interhemispheric Interaction Extend to Intrahemispheric Interaction?" University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1530783272012143.

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VanAlstine, Lee Fredric. "Left out when playing the recorder right: Effects of bimanual performance of melodic instruments in regards to hand asymmetry in musicians." OpenSIUC, 2009. https://opensiuc.lib.siu.edu/theses/58.

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This experiment was based upon earlier research involving beginning musicians' perception of how handedness interferes with their performance of melodic instruments, (VanAlstine, 2006) and the analysis of earlier studies by Laeng and Park (1999) involving the impact of handedness in playing the piano traditionally and in a "reversed" fashion. This study was conducted involving the performance of musical examples on the recorder where the subjects played in a traditional manner, as well as with reversed hand position. Laeng and Park found left-handed beginning and experienced musician's grouped subjects performed better upon a reversed keyboard than performing upon a traditional keyboard, Laeng and Park (1999). VanAlstine hypothesized that beginning musicians would play more correct notes with their dominant hand when playing the melodic examples, whereas advanced students would show less specialization when performing the musical examples with either hand. There were 60 subjects total, 30 beginning players from Carterville Intermediate School and 30 advanced players from the southern Illinois area, including the Southern Illinois University Carbondale School of Music. Subjects were given an Edinburgh-styled handedness test to identify them as either left- or right-handed performers. The subjects were further divided into groups of 15 beginning left-handed players, 15 beginning right-handed players, 15 advanced left-handed players and 15 advanced right-handed players. Subjects played short musical examples on the recorder with traditional fingering and then with reversed hands. The performance was evaluated by two judges. Beginning right-handed musicians who performed upon the "reversed" recorder played as well as performers who were left-handed and played the soprano recorder traditionally, with their dominant hand on the top half of the instrument. The left- and right- handed advanced musicians played the musical examples equally well in both the traditional style and in the "reversed style."

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Pontillo, Teresa Maria. "Spatial ability and handedness as potential predictors of space teleoperation performance." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59564.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2010.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 60-61).
NASA is concerned with finding performance predictors for space teleoperation tasks in order to improve training efficiency. Experiment 1 determined whether scores on tests of spatial skills could predict performance when selecting camera views for a simulated teleoperation task. The hypothesis was that subjects with high spatial ability would perform camera selection tasks more quickly and accurately than those with lower spatial ability, as measured by the Mental Rotation Test (MRT), Purdue Spatial Visualization Test (PSVT), and the Perspective Taking Ability (PTA) test. Performance was defined by task time, number of correct camera selections, preparation time, number of camera changes, and correct identification of clearance issues. Mixed regression and nonparametric tests showed that high-scoring subjects on the MRT and PTA spatial ability tests had significantly lower task times, higher camera selection scores, and fewer camera changes than subjects with lower scores, while High PSVT scorers had significantly lower preparation times. Experiment 2 determined whether spatial ability, joystick configuration, and handedness influenced performance of telerobotic fly-to tasks in a virtual ISS environment. 11 righthanded and 9 left-handed subjects completed 48 total trials, split between two hand controller configurations. Performance was defined by task time, percentage of translational and rotational multi-axis movement, percentage of bimanual movement, and number of discrete movements. High scorers for the MRT, PSVT, and PTA tests had lower Task Times, and High PSVT and PTA scorers made fewer Discrete Movements than Low scorers. High MRT and PTA scorers had a higher percentage of translational and rotational multi-axis movement, and High MRT scorers had a higher percentage of bimanual movement. The overall learning effect appears to be greater than the effect of switching between hand controller configurations. No significant effect of handedness was found. These results indicate that these spatial ability tests could predict performance on space teleoperation tasks, at least in the early phases of training. This research was supported by the National Space Biomedical Research Institute through NASA NCC 9- 58.
by Teresa Maria Pontillo.
S.M.

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Beveridge, Madeleine Edith Louisa. "Motor activation in language processing : effects of handedness, experience, and planning." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9875.

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Embodied Cognition accounts propose that motor activation contributes to semantic representations in action language (Fischer & Zwaan, 2008). However, the nature of this activation remains largely unspecified: in particular, which processes result in relevant activation? Long-term motor experience (e.g., the comprehender’s dominant hand), short-term motor experience (e.g., the hand the comprehender has recently used), and action planning (e.g., the hand the comprehender is planning to use) are all potential candidates. This thesis uses a range of psycholinguistic methods (e.g., timed sentence-picture matching, two-alternative forced-choice sentence-picture matching, spoken sensibility judgements) to distinguish between these possibilities. A first set of experiments investigated how comprehenders’ handedness affects their interpretation of sentences describing manual actions (e.g., I am slicing the tomato). Participants matched sentences of actions to pictures of that action. The Body-Specificity Hypothesis (Casasanto, 2009; Willems, Hagoort, & Casasanto, 2010) predicts that right-handed and left-handed comprehenders will interpret manual action sentences differently, according to whether they would perform that action with their right or their left hand. However, we found that comprehenders appear to interpret manual action sentences according to the hand they use to respond to the task, and not the hand they would typically use to perform manual actions. In addition, this effect was stronger for first-person than third-person sentences, implying that the effect of motor activation is moderated by linguistic context. A second set of experiments used the same paradigm but manipulated at what point comprehenders knew which hand they would use to respond to the sentences: during sentence processing, or after sentence processing was complete. We replicated the finding that comprehenders interpret manual action sentences according to their response hand, and that this effect was stronger for first- than for third-person sentences; but only when comprehenders knew their response hand during sentence processing. In both sets of experiments, there was no effect of whether the picture of the action was presented from an egocentric or allocentric perspective, implying that action sentences are encoded for what effector (in this case, hand) will be used in the action, but not necessarily from what perspective the action will occur. A third set of experiments investigated the existence of a causal role of action planning-based activation on sentence processing. Many studies have shown an effect of language processing on action execution (e.g., Glenberg & Kaschak, 2002; Glenberg et al., 2008), but a fully embodied theory of language also predicts an effect of motor activation on language processing. Here, right-handed participants made spoken judgements about sentences while planning an action with their right or left hand that matched or did not match the action described in the sentence. An effect of response hand on accuracy was found when the task required participants to explicitly judge the congruency of sentence and the action they were preparing, but not otherwise. These results corroborate recent research suggesting that activation of embodied lexical representations may be goal-driven rather than an automatic aspect of language processing (Hoedemaker & Gordon, 2013). Overall, the experiments presented in this thesis suggest a possible role for planning-based motor activation in sentence processing, in line with embodied approaches; however, the results challenge strong accounts of embodiment by suggesting that the effect of planning-based activation is not automatic, and is moderated by linguistic context and task demands.

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Butler, Michael L. "The Effects of Depth of Processing and Handedness On Episodic Memory." University of Toledo / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1177948630.

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Monroe, Stephanie R. "Vulnerability to the Misinformation Effect as a Function of Handedness Consistency." Marietta College / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=marietta1560807407806888.

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Bergström, Sanna, and Anders Lönnquist. "Handedness & Stress resilience - A cross-sectional evaluation of possible relationship." Thesis, Örebro universitet, Handelshögskolan vid Örebro Universitet, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-58382.

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McCauley, Randall Wayne. "Sex and handedness effects on two types of cognitive ability tasks." CSUSB ScholarWorks, 1990. https://scholarworks.lib.csusb.edu/etd-project/462.

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Manning, Margaret. "Laterality, reading and ability in children." Thesis, University of Leicester, 1990. http://hdl.handle.net/2381/34667.

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Various hypotheses derived from Annett's (1972; 1985) genetic theory of handedness are experimentally tested. Results from the first investigation show that excessive bias in favour of right handedness is due to a weakness in left rather than superiority of right hand skill, and is associated with poor nonverbal reasoning ability. A second investigation indicated that risks to reading problems were increased in children with either too little or too much bias in favour of dextrality. A further three studies investigated patterns of ability and disability at both laterality extremes. It was found that language deficits were more frequent in children reduced in bias towards the right hand. An attempt to find a task which those at the dextral tail of the laterality distribution were worse at than those at the sinistral tail met with inconclusive results. The experimental findings are, in general compatible with Annett's hypothesis of a human balanced polymorphism with heterozygote advantage for ability.

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Bodiker, Goldie Marie. "FMRI Analysis of Inverted and Non-inverted Left-handed Subjects During Language Tasks." University of Toledo Health Science Campus / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=mco1096298665.

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Bengtsson, Therése. "Eye preference in human subjects : Consistency across measures and correlation with handedness." Thesis, Linköping University, Linköping University, Department of Physics, Chemistry and Biology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57683.

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The aim of the present study was to determine the distributions of and correlations between hand preference, visual acuity and eye preference through a series of tests in 50 males 50 females aged between 17 and 39 years. Handedness was determined through the Edinburgh handedness inventory questionnaire. The handedness distribution was: right-handed 90%, left-handed 1 %, and ambidextrous 9%. I found that 30 % had better visual acuity with their right eye, 39 % had better visual acuity with their left eye, and 31% had the same visual acuity with both eyes. 75.2% on average used their right eye in the battery of tests and 24.8% on average used their left eye. There were no statistically significant differences between the sexes or age groups with any of the measures. No correlation was found between eye preference and visual acuity or eye preference and hand preference among all subjects. No statistically significance between the sexes was found.

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Smythe, Pamela. "Aspects of phonological processing in sub-groups of left and right handedness." Thesis, University of Leicester, 2002. http://hdl.handle.net/2381/31348.

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This thesis was begun with two intentions. The first was to test a hypothesis of the Annett Right Shift Theory (1972, 1985) that people with poor phonology are less biased to right-handedness than the general population. The second was to establish whether to reduced bias to dextrality applies to deficits in all types of phonological processing. Evidence for an association between poor phonological processing and reduced dextrality was demonstrated in an age cohort of schoolchildren and in two large undergraduate samples. Cases of 'pathological' handedness are unlikely to have caused the association as, in children, the differences increased when those with slow hand skill and poor vocabularies were removed. Support for a genetic influence upon phonological processing was found when groups of children and undergraduates with varying phonological ability also varied for their relatives' handedness. Although, as expected, undergraduates with problems with nonword rhyme were more often left-handed and had more left handed relatives, against predictions, those with phoneme discrimination difficulties were much more dextral in handedness and had fewer left handed relatives. These interesting results were further investigated and poor ability in either phonological production/segmentation or rhyme/awareness was found to be associated with a reduced shift to dextrality. Finally an atypical pattern in dichotic listening (equal errors at each ear) was associated with phonological awareness difficulties, as was the atypical pattern of absence of shift to dextrality in handedness. The findings suggest that poor phonological awareness or phonological production/segmentation could be a risk in the rs - genotype and minor phoneme perception problems could be a disadvantage for the rs++ genotype. It is also suggested that the latter could be part of a multi-sensory problem (Stein and Walsh, 1997). These questions are discussed further and the contributions, limitations and implications of the work are reviewed.

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Sloan, Veronica L. "Sex and handedness effects on measures of spatial ability : a psychometric assessment." Thesis, Queen's University Belfast, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336015.

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Sahu, Aparna A. "Individual Differences in Prospective Memory: The Roles of Handedness and Interhemispheric Interaction." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1289845482.

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Powell, Joanne Lindsey. "An investigation of the association between handedness, cognition, brain structure and function." Thesis, University of Liverpool, 2011. http://livrepository.liverpool.ac.uk/7953/.

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Left- and right-handers show functional and structural brain differences. However, the literature on the relationship between handedness and cognitive ability is inconsistent. Moreover, possible differences in the neuroanatomical correlates of cognitive ability, including regional grey matter (GM) volume, between left- and right-handers have not been explored. This thesis describes work with two main aims: (i) to explore differences in brain structure and function between left- and right-handers using MRI on a sample of left- (n=40) and right- (n=42) handers, and (ii) to explore the effect of handedness on the neuroanatomical correlates of cognitive capacity on the same cohort. The effect of sex and handedness on pars opercularis (PO) and pars triangularis (PTR) volume and the sulcal contours defining these regions are described in Chapter 5. PO volume asymmetry is leftward (left-greater-than-right) in right-handed males, non-asymmetrical in right-handed females and rightward in left-handed males and females. PTR volume is rightward in right-handers and non-asymmetrical in left-handers. The inferior frontal sulcus is discontinuous more often in the right than left hemisphere in right-handers and discontinuous more often in the left than right hemisphere in left-handers. The probability of presence of diagonal sulcus is higher in the right than the left hemisphere for left-handers. A second part to this study found a significant effect of handedness on foot preference for kicking and parental handedness. In Chapter 6 fractional anisotropy (FA) asymmetry across the whole brain is explored using voxel-wise statistics on FA maps obtained from diffusion weighted images: increased FA is found in right-handers, and FA asymmetry along the uncinate fasciculus and arcuate fasciculus in both groups. Chapter 7 shows significantly greater leftward language laterality in right-handers and greater activation in right IFG in response to a language production task in left- compared to right-handers. Working memory score is higher in right-handers is associated with increased leftward language laterality. Subjects with opposed language and spatial laterality perform better in tests assessing verbal comprehension and perceptual organization. Next, relationships between GM volume and cognitive ability is explored for fluid and crystallised intellectual functioning using voxel-based morphology (Chapter 8). Significant differences in the GM correlates of fluid and crystallised intelligence were found between the handedness groups. Lastly, Chapter 9 explores the relationship between prefrontal cortex (PFC) volume and intentionality in left- and right-handers using stereological volume estimates from T1-weighted MR images. Although no significant difference in intentionality score was found between the handedness groups, higher scores of intentionality were associated with larger orbital PFC volume in right-handers, but with larger dorsal PFC volume in left-handers. This research extends the literature demonstrating differences in brain structure and function between left- and right-handers. Overall, the results suggest that individuals may achieve similar cognitive ability scores with different brain designs. Future research should consider the effect of group differences in the population and how this might influence brain ‘design’ and cognitive ability.

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Takyar, Ankit. "Identifying Potential Candidate SNP's and Genes Linked to Handedness for Future Study." Thesis, The University of Arizona, 2012. http://hdl.handle.net/10150/271944.

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The goal was to identify genes for future study that might be linked to handedness for potential candidate gene study. We were able to find 3 major genes through statistically analyzing SNP data within a Genome-wide association Statistical Analysis tool, PLINK. 27 SNPs were chosen based on P-values of below .001, further analysis was done to these 27 SNPs to figure out their gene locus. Using NCBI we found 21 SNPs were within a gene locus. A total of 16 genes were found from the 21 SNPs that were located within a gene locus. Three extra genes were examined since they were located in a gene of interest CTNNA2. The genes found were further screened for high expression in subcortical regions and that have been implicated in neural function or brain development. Out of the 17 genes determined, IRAK2, NRG1, and CTNNA2 adhered to the criteria for screening.

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Atkinson, Michael Henry 1962. "Immune disease, headaches, and handedness in learning disabled and regular education students." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/278020.

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The relationship of immune disease, headaches, and handedness to learning disabilities and attention deficit disorder (ADD) was investigated. Questionnaires were completed by the parents of learning disabled (LD) and regular education students attending public middle school. A measure of ADD was included to separate the sample of LD students into two categories: those with academic and behavior disorders and those with only academic disorders. Discriminant analyses failed to indicate a significant difference between the LD and regular education students on measures of immune disease, headaches, handedness, or attention deficit disorder. Chi-square analyses of the data indicated that the only significant difference between LD and regular education students was on a measure of allergies to food and drink where the LD students reported a higher incidence as compared to regular education students. Implications of these findings are discussed.

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Hancock, Roeland. "Dynamic Properties of Dopamine Asymmetry: A Basis for Functional Lateralization." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/299105.

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Functional asymmetries, most commonly associated in humans with population-level hand preference and lateralization in language processing, are complex, heterogeneous traits with poorly understood biological and genetic bases. Notably, functional asymmetries are also associated with familial non-right handedness suggesting that common genetic factors influence both handedness and functional lateralization. This dissertation has two aims. The first is the development of a specific biological hypothesis that may partially account for the consistent co-lateralization of hand preference and prefrontal language function. I argue that asymmetries in local neural properties that affect the excitability and signal-to-noise ratio of neural assemblies can produce a bias in the direction and, to some extent, the degree of functional lateralization for complex functions. At a high level of representation, this hypothesis is similar to long-standing theories of hemispheric differences, but differs from these by providing a single biological difference between hemispheres that influences both motor and prefrontal asymmetries. Specifically, I propose that a hemispheric asymmetry in the ratio of activity at D1 and D2 dopamine receptors can account for both forms of asymmetry. The second aim is to identify novel electrophysiological and behavioral correlates of genetic effects linked to handedness. By applying a standard genetic model to familial handedness data, I obtain an estimate of these genetic effects for individual research participants that may improve sensitivity over previous studies that have primarily used categorical classifications to study familial handedness effects. Two EEG studies of executive function provide evidence for computational changes associated with familial handedness. The first, an auditory oddball paradigm, suggests that cortical noise is increased in conjunction with estimated genetic effects associated with left handedness. In the second study, a go-nogo task, a dissociation between response inhibition and response conflict processing was found with respect to estimated genetic effects associated with left handedness. In addition to bearing on current theories of conflict processing, these results may provide indirect evidence for dopaminergic contributions to neurological and behavioral differences associated with familial sinistrality. Additional studies of resting EEG and behavioral responses to Necker cube viewing provide additional evidence for broad effects of familial sinistrality.

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Jansen, van Vuuren Anica. "Handedness and the geometry and hemodynamics of the branches of the aortic arch." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/12883.

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Includes bibliographical references.
Asymmetry in the vasculature arising from the human aortic arch seems the obvious place to look for an anatomical basis for lateralized cerebral functions, but this relationship has never systematically been investigated. This study explored the relationship between handedness and the anatomical and hemodynamic characteristics of the carotid arteries, analysing potential asymmetries between the left and right common, internal and external carotid arteries in leftha-nded versus right-handed individuals. The study is separated into two chapters: geometric (n = 199) and hemodynamic (n = 234). A revised version of the Edinburgh Handedness Inventory classified all participants into relevant handedness preference categories. For the geometric study, detailed measurements of the common carotid arteries in computed tomography angiography scans were obtained using Radiant DICOM Viewer (64-bit) imaging software. Selected geometric parameters of the vessels measured included minimum, mean, and maximum diameters, length, angle and calculated resistance to blood flow. Cases of unconventional branching patterns were analysed separately. For the hemodynamic study, Speed and Accuracy Target Tests quantified the participants’ handedness performance. Doppler ultrasound was performed using the Vivid i GE Ultrasound system, on the common, internal and external carotid arteries. Hemodynamic parameters of the Doppler waveform were recorded, including Peak systolic and end-diastolic velocity, Resistive index, Pulsatility index, volume flow rate, and vessel diameter. The data was analysed with mixed design ANOVAs, discriminant function analyses, multiple regressions, and paired and independent t-tests, to investigate the asymmetries and predictive properties of the measured variables

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Pyykönen, Krista. "A Handful of Considerations : Perspectives on Left-handedness in Violin Playing and Violin Pedagogy." Thesis, Kungl. Musikhögskolan, Institutionen för musik, pedagogik och samhälle, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kmh:diva-1913.

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The topic of this study is left-handedness as a phenomenon in violin playing and classical violin pedagogy. The aim of the study is to investigate what kind of knowledge and approaches are crucial for taking left-handedness into account when teaching left-handed violinists in the normatively right-handed violin pedagogy. The body of knowledge arises from literature on hemispheric lateralization, left-handedness, attributes of violin playing, and earlier studies on hand-preference and musical performance, hemispheric adaptations to musical training, and children’s conceptions of left and right. A background-study was carried out on left-handedness in guitar playing. The study employs abductive reasoning, has an auto-ethnographic thread and draws on the hermeneutical epistemology. The theoretical framework rests on the cultural-psychological perspective on music education. The data was collected in two parts using qualitative ethnography-inspired methods. First qualitative thematic interview was used for gathering strategically sampled data from expert respondents on violin playing, pedagogy and violin-making. Secondly non-participant observation and follow-up interview was used for examining a beginner violin lesson. The findings of the study suggest that violin pedagogues need knowledge of the lateralization effects on violin playing and methodological understanding for pupils’ handedness and maturity of motor development. The data suggests that left-handedness is not a disadvantage in violin playing when provided with education that recognizes it. Reversed violin playing is considered as an alternative for strongly left-handed pupils. The data shows that violin education needs open discussion on left-handedness in terms of prejudices in orchestras, and raised awareness on the availability of left-handed instruments.

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Cederlund, Joakim. "Eye preference in humans and its correlation with eye dominance, visual acuity and handedness." Thesis, Linköpings universitet, Biologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129460.

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Handedness is the most obvious expression of lateralized behaviour in humans. However, there is only limited knowledge about other forms of lateralized behaviour, e.g. preferential use of an eye and whether these may correlate with handedness. Thus to investigate this, 100 subjects (50 males and 50 females) between 11 and 80 years of age were assessed for their eye preference, eye dominance, visual acuity, and handedness. Eye preference was assessed by performing four different monocular tasks, eye dominance by performing the binocular Dolman test, visual acuity was assessed with a Snellen chart and handedness was surveyed using the Edinburgh Handedness Inventory. Regarding eye preference, the right eye was preferred by 69% of the subjects. 90 % of the subjects were consistent for their preferred eye across all four tasks. 66% of the subjects had a dominant right eye, 33% had left eye dominance and 1% could not be assessed using the Dolman test. 56% of the subjects differed in their visual acuity between both eyes, while 43% had the same visual acuity in both of their eyes. 86% of the subjects were right-handed while 4% were left handed and 10% were ambidextrous. Significant correlations were found between visual acuity and eye preference and between visual acuity and eye dominance. The study also found a positive correlation between handedness and eye preference. These results support the notion that there is a weak correlation between the different aspects of lateralized behaviour in humans.

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Choudhary, Carolyn J. "Why laterality matters in trauma : sinister aspects of memory and emotion." Thesis, University of Stirling, 2008. http://hdl.handle.net/1893/1225.

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This thesis presents an eclectic mix of studies which consider laterality in the context of previous findings of increased prevalence of Posttraumatic Stress Disorder (PTSD) in male combat veterans with non-consistent right hand preference. Two studies extend these findings not just to civilian populations and women, but to left handers and find that left, rather than mixed, handedness is associated with increased prevalence of PTSD in both general population and clinical samples, and to severity of symptoms in the former. To examine issues relevant to the fear response in healthy populations, a movie excerpt is shown to be theoretically likely to target the emotion of fear and to generate subjective and physiological (skin conductance) responses of fear. The film is used as a laboratory analogue of fear to examine possible differences in left and right handers in memory (for events of the film) and in an emotional Stroop paradigm known to produce a robust and large effect specifically in PTSD. According to predictions based on lateralisation of functions in the brain relevant to the fear response, left handers show a pattern of enhanced memory for visual items and poorer memory for verbal material compared to right handers. Immediately after viewing the film, left handers show an interference effect on the Stroop paradigm to general threat and film words and increased response latency compared to right handers, approaching performance of previously reported clinical samples with PTSD. A novel non-word Stroop task fails to show these effects, consistent both with accounts of interference as language processing effects and compromised verbal processing in PTSD. Unexpected inferior performance of females in memory for the film, contrary to previous literature, may also be amenable to explanations invoking compromised left hemisphere language functions in fear situations. In testing one theory of left handedness as due to increased levels of in utero testosterone, the 2D:4D (second to fourth digit ratio) provides mixed evidence in two samples. A possible association of more female-like digit ratios in males with PTSD is a tentative finding possibly relevant to sex differences in prevalence of PTSD. A critique of existing and inadequate theoretical accounts of handedness concludes the thesis and proposes a modification of the birth stress hypothesis to one specifically considering peri-natal trauma to account for the above findings. This hypothesis remains to be empirically tested.

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Bilić, Katja. "Relationship between memory performance, visuospatial function and functional lateralization in adults." Thesis, Umeå universitet, Institutionen för psykologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-105777.

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Age-related decline in memory and other cognitive functions, such as visuospatial functions is widely studied and well documented. In recent years, some studies have also found relationships between memory performance and functional body lateralization, with individuals who are inconsistently lateralized (e.g. have inconsistent handedness) scoring higher on episodic memory tests. The objectives of this study were to investigate relationships and possible differences between episodic and semantic memory performance, and visuospatial functions as a function of functional lateralization consistency in a large population-based study. In total, 1283 adult men and women participants, with age ranging from 25 to 100 years, were tested within the Betula prospective cohort study (Nilsson et al., 1997) where they were included in the fifth wave (T5) of data collection. Participants were divided into groups of consistent or inconsistent functional lateralization regarding respective hand-, foot-, and eyedness. Results revealed weak to moderate relationship between variables of functional laterality and its consistency. While age was significant predictor of memory performance and visuospatial functions, sex and functional laterality consistency variables were insignificant. Results are discussed in relation to previous studies and to hemispheric interaction theory.
Betula prospective cohort study (Nilsson et al., 1997, 2004)

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Kelly, Rachel Louise. "Understanding the neurophysiology of action interpretation in right and left-handed individuals." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53589.

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Investigating the neurophysiology behind our action encoding system offers a way of probing the underlying mechanisms regarding how we understand seen action. The ability to mentally simulate action (motor simulation) is a strong proposal to understand how we interpret others’ actions. The process of how we generate accurate motor simulations is proposed to be reliant on the context of the movement and sensory feedback from the limb. However, the neurophysiological mechanisms behind motor simulation are not yet understood. Known motor physiology for right-handed individuals show there is a left parietal-frontal network for the mental simulation of skilled movements; however, it remains unclear whether this is due to right limb dominance of the observer’s motor system because action simulation research has been focused primarily on right-handed individuals. The goal of this dissertation is to understand the underlying neurophysiology of the motor simulation process during action encoding. Generally, we propose different strategies of action simulation between right and left handed individuals. More specifically, we propose that right-handed individuals rely on their motor dominant left hemisphere for action encoding and motor simulation, while left-handed individuals will rely on their motor dominant right hemisphere. We will test this by evaluating neurobehavioral patterns of potential symmetry and asymmetry of motor simulation and action encoding based on patterns of limb dominance. We will also evaluate how impaired sensory feedback affects motor simulations, which can reveal how limb state affects the simulation process. The results of this series of studies will fill a void in our basic understanding of the motor simulation process and may generalize to populations with upper limb functional loss. Specifically, those with different hand dominance may require different rehabilitation programs in order to retrain an affected limb.

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Longo-Bartel, Martha Jane. "Left-handed teaching techniques for the right handed." CSUSB ScholarWorks, 2000. https://scholarworks.lib.csusb.edu/etd-project/1681.

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Left-handedness is an invisible handicap in today's classrooms. The education systsem in the United States makes special considerations and accommodations for special needs of students, yet left-handed individuals do not receive much consideration in a mainstream classroom. Experts say that up to twenty percent of children in Canada and the United States are left-handed. This project discusses how these left-handed children have to work in a right-handed world. The focus of this study was to provide right-handed teachers with teaching techniques, positive suggestions, and common sense approaches to accomodate the left-handed pupil.

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Whitman, Darlene. "A study of handedness, familial sinistrality and academic concentration in subgroups of males and females." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1994. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23757.pdf.

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Cornish, Kim M. "Variations in spatial cognition in adults and children : influence of handedness, familial sinistrality and sex." Thesis, Royal Holloway, University of London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242847.

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bhattacharya, chandrima. "Handedness Differences in Hindsight Bias: Insight into Mechanisms and Theory of a Common Decision Bias." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1333733307.

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Edwall, Louise. "Evaluating the correlation between grip strength, forearm circumference, motor dexterity and handedness in university students." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-39860.

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Background: Handedness has been associated with different abilities, diseases and personality traits and its effect on language, motor dexterity and handedness are a well-studied matter. Measuring grip strength, forearm circumference and motor dexterity is a common way to get a better understanding the influence of handedness. Lately, studies have shown that there is a difference between right and left-handed in these above stated variables. Aim: The aim of this study was to investigate differences between grip strength and motor dexterity for dominant and non-dominant hand in both left and right-handed. A second aim was to investigate the association between grip strength and motor dexterity or forearm circumference. A third aim was to study the impact heredity have on handedness. Method: The study was designed as an experimental cross-sectional study, including 29 healthy students, age 18-30. Information about age, hand dominance, current health status, former elite carrier and heredity of handedness was collected. Forearm circumference were measured in cm at the largest part of the forearm. The Purdue pegboard test measured motor dexterity by adding pegs, collars and washers to the board on time, giving a total score. Takei Grip-D were used for grip strength (kg) measurement. Mann-Whitney U test, chi-square test and Spearman's correlation (rs) were used for analysis presented as median (min-max). Results: There was no significant difference between right (1.6kg; -4.1-8.0) and left-handed (0.6kg; - 3.4-7.6) regarding grip strength (p=0.43). Although, there was a large to nearly perfect correlation between forearm circumference and grip strength in both right (dominant rs=0.59; non-dominant rs=0.73) and left-handed (dominant rs=0.83; non-dominant rs=0.90). Also, a moderate correlation between motor dexterity and difference in grip strength was found for both right (rs=0.43) and left-handed (rs=-0.42). The studied group was not affected by their relative’s handedness to determine their own handedness (p=0.56). Conclusion: Forearm circumference and grip strength have a large association for both right and lefthanded. The correlation between motor dexterity and difference in grip strength were contrariwise comparing right and left-handed, indicating that handedness should be studied separate.

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Dissertations / Theses on the topic 'Handedness'

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