Relevant bibliographies by topics / Hemispheric interactions

Academic literature on the topic 'Hemispheric interactions'

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Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Hemispheric interactions"

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Hartikainen, Kaisa M. "Emotion-Attention Interaction in the Right Hemisphere." Brain Sciences 11, no. 8 (July 29, 2021): 1006. http://dx.doi.org/10.3390/brainsci11081006.

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Hemispheric asymmetries in affective and cognitive functions have been extensively studied. While both cerebral hemispheres contribute to most affective and cognitive processes, neuroscientific literature and neuropsychological evidence support an overall right hemispheric dominance for emotion, attention and arousal. Emotional stimuli, especially those with survival value such as threat, tend to be prioritized in attentional resource competition. Arousing unpleasant emotional stimuli have prioritized access, especially to right-lateralized attention networks. Interference of task performance may be observed when limited resources are exhausted by task- and emotion-related processing. Tasks that rely on right hemisphere-dependent processing, like attending to the left visual hemifield or global-level visual features, are especially vulnerable to interference due to attention capture by unpleasant emotional stimuli. The aim of this review is to present literature regarding the special role of the right hemisphere in affective and attentional brain processes and their interaction. Furthermore, clinical and technological implications of this interaction will be presented. Initially, the effects of focal right hemisphere lesion or atrophy on emotional functions will be introduced. Neurological right hemisphere syndromes including aprosodia, anosognosia and neglect, which further point to the predominance of the intact right hemisphere in emotion, attention and arousal will be presented. Then there will be a brief review of electrophysiological evidence, as well as evidence from patients with neglect that support attention capture by emotional stimuli in the right hemisphere. Subsequently, experimental work on the interaction of emotion, attention and cognition in the right hemispheres of healthy subjects will be presented. Finally, clinical implications for better understanding and assessment of alterations in emotion–attention interaction due to brain disorder or treatment, such as neuromodulation, that impact affective brain functions will be discussed. It will be suggested that measuring right hemispheric emotion–attention interactions may provide basis for novel biomarkers of brain health. Such biomarkers allow for improved diagnostics in brain damage and disorders and optimized treatments. To conclude, future technological applications will be outlined regarding brain physiology-based measures that reflect engagement of the right hemisphere in affective and attentional processes.
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METUKI, NILI, SHANI SINKEVICH, and MICHAL LAVIDOR. "Lateralization of semantic processing is shaped by exposure to specific mother tongues: The case of insight problem solving by bilingual and monolingual native Hebrew speakers." Bilingualism: Language and Cognition 16, no. 4 (February 15, 2013): 900–913. http://dx.doi.org/10.1017/s1366728913000023.

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Solving insight problems is a complex task found to involve coarse semantic processing in the right hemisphere when tested in English. In Hebrew, the left hemisphere (LH) may be more active in this task, due to the inter-hemispheric interaction between semantic, phonological and orthographic processing. In two Hebrew insight problems experiments, we revealed a performance advantage in the LH, in contrast to the patterns previously observed in English. A third experiment, conducted in English with early Hebrew–English bilinguals, confirmed that the LH advantage found with Hebrew speakers does not depend on specific task requirements in Hebrew. We suggest that Hebrew speakers show redundancy between the hemispheres in coarse semantic processing in handling frequent lexical ambiguities stemming from the orthographic structure in Hebrew. We further suggest that inter-hemispheric interactions between linguistic and non-linguistic processes may determine the hemisphere in which coarse coding will take place. These findings highlight the possible effect of exposure to a specific mother tongue on the lateralization of processes in the brain, and carries possible theoretical and methodological implications for cross-language studies.
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Rastatter, Michael P., and Andrew Stuart. "Hemispheric Picture-Naming Hierarchies in Stuttering Subjects." Perceptual and Motor Skills 81, no. 3 (December 1995): 899–908. http://dx.doi.org/10.2466/pms.1995.81.3.899.

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The present study was done to investigate the linguistic organization of the right hemisphere of stuttering subjects and the interhemispheric interactions that underlie verbal output in this population. Naming reaction times of 14 stuttering adults were measured to unilaterally presented pictures corresponding to vocabulary levels of <5.5, 9.5–10.5, and > 18.0 years of age. An analysis of variance of latencies showed a significant main effect for picture vocabulary-age. Post hoc tests were interpreted as suggesting that the right hemisphere of stuttering subjects was capable of differential picture-encoding operations in a manner similar to the left hemisphere of normal speakers. Also, naming latencies favored left visual-field stimulations by 34 msec. Taken with significant and high correlations between visual fields for each level of picture vocabulary score, the right hemispheres of the stuttering subjects appeared responsible for picture-encoding operations. Left-hemispheric stimulus processing was not predicted, suggesting differences may exist in interhemispheric interactions underlying picture-naming functions in stuttering populations.
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Vidal, A. Cristina, Paula Banca, Augusto G. Pascoal, Gustavo C. Santo, João Sargento-Freitas, Ana Gouveia, and Miguel Castelo-Branco. "Bilateral versus ipsilesional cortico-subcortical activity patterns in stroke show hemispheric dependence." International Journal of Stroke 12, no. 1 (October 22, 2016): 71–83. http://dx.doi.org/10.1177/1747493016672087.

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Background Understanding of interhemispheric interactions in stroke patients during motor control is an important clinical neuroscience quest that may provide important clues for neurorehabilitation. In stroke patients, bilateral overactivation in both hemispheres has been interpreted as a poor prognostic indicator of functional recovery. In contrast, ipsilesional patterns have been linked with better motor outcomes. Aim We investigated the pathophysiology of hemispheric interactions during limb movement without and with contralateral restraint, to mimic the effects of constraint-induced movement therapy. We used neuroimaging to probe brain activity with such a movement-dependent interhemispheric modulation paradigm. Methods We used an fMRI block design during which the plegic/paretic upper limb was recruited/mobilized to perform unilateral arm elevation, as a function of presence versus absence of contralateral limb restriction ( n = 20, with balanced left/right lesion sites). Results Analysis of 10 right-hemispheric stroke participants yielded bilateral sensorimotor cortex activation in all movement phases in contrast with the unilateral dominance seen in the 10 left-hemispheric stroke participants. Superimposition of contralateral restriction led to a prominent shift from activation to deactivation response patterns, in particular in cortical and basal ganglia motor areas in right-hemispheric stroke. Left-hemispheric stroke was in general characterized by reduced activation patterns, even in the absence of restriction, which induced additional cortical silencing. Conclusion The observed hemispheric-dependent activation/deactivation shifts are novel and these pathophysiological observations suggest short-term neuroplasticity that may be useful for hemisphere-tailored neurorehabilitation.
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Sakaguchi, Yukitoshi, and Yoshio Sakurai. "Disconnection between Rat’s Left and Right Hemisphere Impairs Short-Term Memory but Not Long-Term Memory." Symmetry 13, no. 10 (October 4, 2021): 1872. http://dx.doi.org/10.3390/sym13101872.

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Split-brain experiments, which have been actively conducted since the twentieth century, have provided a great deal of insight into functional asymmetry and inter-hemispheric interactions. However, how communication between the left and right hemispheres directly contributes to memory formation is still poorly understood. To address this issue, we cut the rat commissural fibers prior to performing behavioral tests, which consisted of two short-term and two long-term memory tasks. The result showed that cutting the commissural fibers impairs short-term memory but not long-term memory. This suggests that the left-right hemispheric interaction through the commissural fibers contributes to the appropriate formation of short-term memory, but not that of long-term memory. Our findings would help to elucidate dynamic memory formation between the two hemispheres and contribute to the development of therapeutics for some neurological diseases which cause a reduction in the inter-hemispheric interaction.
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Corballis, M. "Hemispheric interactions in simple reaction time." Neuropsychologia 40, no. 4 (2002): 423–34. http://dx.doi.org/10.1016/s0028-3932(01)00097-5.

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Banegas, Inmaculada, Isabel Prieto, Ana Belén Segarra, Francisco Vives, Magdalena Martínez-Cañamero, Raquel Durán, Juan de Dios Luna, Marc de Gasparo, Germán Domínguez-Vías, and Manuel Ramírez-Sánchez. "Asymmetric Interaction of Neuropeptidase Activities between Cortico-Limbic Structures, Plasma and Cardiovascular Function after Unilateral Dopamine Depletions of the Nigrostriatal System." Biomedicines 10, no. 2 (January 29, 2022): 326. http://dx.doi.org/10.3390/biomedicines10020326.

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In emotional processing, dopamine (DA) plays an essential role, and its deterioration involves important consequences. Under physiological conditions, dopamine exhibits brain asymmetry and coexists with various neuropeptides that can coordinate the processing of brain functions. Brain asymmetry can extend into a broader concept of asymmetric neurovisceral integration, including behavior. The study of the activity of neuropeptide regulatory enzymes (neuropeptidases, NPs) is illustrative. We have observed that the left and right brain areas interact intra- and inter-hemispherically, as well as with peripheral tissues or with physiological parameters such as blood pressure or with behaviors such as turning preference. To obtain data that reflect this integrative behavior, we simultaneously analyzed the impact of left or right brain DA depletion on the activity of various NPs in corticolimbic regions of the left and right hemispheres, such as the medial prefrontal cortex, amygdala and hippocampus, as well as on the plasma activity of the same aminopeptidase activities (APs) and on systolic blood pressure (SBP). Intra- and inter-hemispheric interactions as well as the interactions of NPs from the left or right hemispheres were analyzed with the same plasma APs and the SBP obtained from sham and from left or right lesioned rats. The results demonstrate a complex profile depending on the hemisphere considered. They definitively confirm an asymmetric neurovisceral integration and reveal a higher level of inter-hemispheric corticolimbic interactions including with SBP after left dopamine depletion.
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Mathur, Rohit, Jia Xing, Robert Gilliam, Golam Sarwar, Christian Hogrefe, Jonathan Pleim, George Pouliot, et al. "Extending the Community Multiscale Air Quality (CMAQ) modeling system to hemispheric scales: overview of process considerations and initial applications." Atmospheric Chemistry and Physics 17, no. 20 (October 19, 2017): 12449–74. http://dx.doi.org/10.5194/acp-17-12449-2017.

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Abstract. The Community Multiscale Air Quality (CMAQ) modeling system is extended to simulate ozone, particulate matter, and related precursor distributions throughout the Northern Hemisphere. Modeled processes were examined and enhanced to suitably represent the extended space and timescales for such applications. Hemispheric-scale simulations with CMAQ and the Weather Research and Forecasting (WRF) model are performed for multiple years. Model capabilities for a range of applications including episodic long-range pollutant transport, long-term trends in air pollution across the Northern Hemisphere, and air pollution–climate interactions are evaluated through detailed comparison with available surface, aloft, and remotely sensed observations. The expansion of CMAQ to simulate the hemispheric scales provides a framework to examine interactions between atmospheric processes occurring on various spatial and temporal scales with physical, chemical, and dynamical consistency.
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Chen, Qunlin, Yunman Xia, Kaixiang Zhuang, Xinran Wu, Guangyuan Liu, and Jiang Qiu. "Decreased inter-hemispheric interactions but increased intra-hemispheric integration during typical aging." Aging 11, no. 22 (November 21, 2019): 10100–10115. http://dx.doi.org/10.18632/aging.102421.

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Saenko, I. V., L. A. Chernikova, A. E. Khizhnikova, E. I. Kremneva, and I. B. Kozlovskaya. "DYNAMICS OF THE PROCESSES OF INTER- AND INTRA-HEMISPHERIC INTERACTIONS (FUNCTIONAL CONNECTIVITY) OF THE BRAIN MOTOR ZONES RESPONSIBLE FOR WALKING IN NEURO-REHABILITATION OF PATIENTS WITH FOCAL DAMAGES OF THE CENTRAL NERVOUS SYSTEM." Aerospace and Environmental Medicine 54, no. 6 (2020): 136–43. http://dx.doi.org/10.21687/0233-528x-2020-54-6-136-143.

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The paper discusses the findings of studying neuroplastic transformations in the brain cortex owing to stroke patients therapy using soft multimodel exoskeleton complex (MEC) REGENT in comparison with activation of the cortex structures controlling locomotion in healthy people. The MEC course applied to hemiparetic patients increases walk speed; changes in the activity zones detected by functional magnetic resonance imaging (fMRI) attest to the positive trajectory of neuroplastic processes, i.e. activation in the precentral gyrus (primary motor cortex), secondary association cortex (inferior parietal lobule) on the damaged hemisphere, and right-side primary sensorimotor cortex. Analysis of the functional connectivity between the areas of interest before and after the MEC therapy elicited significant changes in the inter- and intra-hemispheric connections. This positive cortical reorganization has its origin in reduction of excitory interactions between the secondary associative areas (inferior parietal lobules in both hemispheres) and alleviation of the inhibitory interaction between the inferior parietal lobule and primary right-side sensorimotor cortex in the damaged hemisphere.
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Dissertations / Theses on the topic "Hemispheric interactions"

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Kavcic, Voyko. "Hemispheric Interactions and Event-Related Potentials in Lateralized Stroop and Stroop Analog Tasks." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc277627/.

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Classical Stroop stimuli and newly developed face/word Stroop analog stimuli were used to investigate hemispheric interactions in Stroop interference effects (SEs) and corresponding event-related potentials (ERPs). Lateralized stimuli were presented unilaterally and bilaterally as congruent or incongruent color strip-word or face-word pairs (to invoke right hemisphere (RH) and left hemisphere (LH) specialization, respectively, in the latter case). The common finding for such tasks is that responses for the congruent condition are faster and more accurate than for the incongruent condition (i.e., the SE). A primary prediction is that the SE will be maximized when both the distractor and target components, or distractor alone, are presented to the specialized hemisphere (i.e., LH for words and RH for faces). A total of 88 right-handed University of North Texas students participated in one of four experiments. Participants manually responded to one component of the stimuli (i.e., color, face, or word), while ignoring the other. Behaviorally, participants showed a robust SE across all experiments, especially for the face/word task with word targets. Findings from the face/word Stroop analog tasks also indicated that SEs were produced by selective attention to either faces or words, implicating a role for top-down (controlled) processes. Hemispheric asymmetries were observed only for bilateral presentations of the face/word Stroop analog stimuli and did not differ for word versus face targets. The results suggest that the LH is less susceptible to interference from the RH than vice versa. Electrophysiologically, anterior N1 and P1, posterior P1 and N1, N2, and P3 components were identified. A SE was found for P3 amplitudes, but not latencies, across all four experiments such that the congruent condition generated greater amplitudes than the incongruent condition, suggesting that the P3 is an index of task difficulty. Surprisingly, SEs were also observed for the early ERP components, albeit embedded in higher order interactions. Taken together, the ERP evidence suggests that there is no single locus of the SE, and instead, the SE appears to be distributed over several stages of information processing.
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Cherbuin, Nicolas, and n. cherbuin@anu edu au. "Hemispheric interaction: when and why is yours better than mine?" The Australian National University. Faculty of Science, 2006. http://thesis.anu.edu.au./public/adt-ANU20060317.135525.

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The performance of most tasks requires some interaction between the cerebral hemispheres. Despite this fact, research has focused on demonstrating that each hemisphere is specialised for certain processes and has largely neglected this interaction. ¶ Recent research has recognised the need for a better understanding of how resources are shared between the cerebral hemispheres. While these studies have shed light on factors external to the participants being tested, such as the type of task and stimuli used, presentation times, and different measurement methods, they have neglected variables that differ between individuals. The studies reported here focused on factors internal to the participants. They include sex, age, handedness, functional lateralisation, practice, attention, and hemispheric activation, which vary between individuals or within individuals across time, and have been shown to influence the structure and morphology of the corpus callosum which is the main pathway for hemispheric interactions. ¶ This thesis examines the relationship of these variables to the efficiency of hemispheric interactions. ¶ A literature review of the factors affecting hemispheric interactions and interhemispheric transfer is presented in Chapter 1, and methodological issues relating to the measurement of these variables in Chapter 2. Based upon this research, two tasks, the Poffenberger paradigm and a letter-matching task, were selected to assess interhemispheric transfer time and hemispheric interactions, respectively, and to investigate the relationship between these two variables. ¶ Chapters 3 and 4 present the findings of the principal study, using a large sample of participants and regression analysis, which demonstrate that both faster interhemispheric transfer and more extreme left-handedness are associated with greater efficiency of hemispheric interaction. Surprisingly, other factors which were expected to influence hemispheric interactions (age, sex, functional lateralisation, and attention) did not have a significant effect on this variable. ¶ A strong practice effect found in the task used in Chapters 3 and 4 is analysed in Chapter 5. Contrary to previous findings, this practice effect seems not to be due to a shift from sequential, rule-based processing to memory-retrieval, but rather, is a more general practice effect consistent with progressively more efficient use of neural resources. ¶ Chapter 6 shows that individuals with dyslexia not only demonstrate an abnormally fast interhemispheric transfer, but also attentional deficits, due probably to decreased efficiency in hemispheric interactions. Because some clinical populations, such as individuals with dyslexia, have been shown to have hemispheric interaction deficits, the study of such clinical samples can provide valuable information about the relationship between hemispheric interactions and other individual variables. ¶ In Chapter 7 it is demonstrated that both latent and induced patterns of lateralised hemispheric activation affect hemispheric interactions. This suggests that assessment of hemispheric activation is important not only in this field, but probably also more generally in neuropsychological research. These findings highlight the need for a simple, inexpensive measure of hemispheric activation that can be applied routinely in cognitive experiments. ¶ Chapter 8 presents a new technique to measure lateralised brain activation in typical psychological experiments using functional tympanic membrane thermometry (fTMT). This measure relies on the measurement of ear membrane temperature as an index of hemispheric activation. The technique is simple and inexpensive, and is shown to be suitable for the assessment of hemispheric activation patterns during typical experiments. ¶ In conclusion, individual characteristics such as the efficiency of interhemispheric transfer, handedness, functional lateralisation, attention, and hemispheric activation are important factors to consider when researching hemispheric interactions in both normal and clinical populations. Furthermore, future research will benefit from this newly developed measure, fTMT, by allowing the systematic study of the effects of hemispheric activation in brain processes.
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Andres, Michael. "Number and finger interactions : from the parietal to the motor cortex / Interactions entre les nombres et les doigts : du cortex pariétal au cortex moteur." Université catholique de Louvain, 2006. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-03192006-125748/.

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The observations made in brain-lesioned patients and the result of functional brain imaging studies converge to the hypothesis that the posterior parietal cortex (PPC) is involved in calculation and number processing. However, if numerical disorders generally result from a left parietal lesion, the results of some brain imaging studies suggest that the right PPC could also play a role in number magnitude processing. In order to clarify this question, we used transcranial magnetic stimulation to induce a virtual lesion of the left or right PPC in healthy subjects while they performed number comparison. Our results show that the integrity of the left PPC is a necessary condition for the precise discrimination required during close number comparison; whereas the comparison of far numbers can be performed by either hemisphere as suggested by the fact that this task is affected only by the simultaneous virtual lesion of both hemispheres. In order to better identify which processes underlie the numerical competence of the PPC, we then studied the possible interactions between number processing and visuo-motor functions. Indeed, a meta-analysis performed on functional imaging data revealed that number processing depends on parietal regions, but also on certain premotor areas, which are very close to those involved in the control of finger movements. In a first series of experiments, we thus observed an excitability increase in motor circuits during the enumeration of dots presented on a computer screen. Given that the counting task was performed with both hands at rest, this increase was interpreted as reflecting the mental simulation of pointing movements or sequential finger rising as counting goes on. In a second series of experiments, we showed that information related to number magnitude could interfere with the aperture of the finger grip required to grasp an object. These results suggest that the conformation of the hand to object size shares, with the representation of numbers, common processes for magnitude estimate. In conclusion, our thesis supports the hypothesis that our numerical capacities rely, at least partially, on visuo-motor functions involving the PPC; this could explain why the numerical capacities of the left hemisphere, which is dominant for motor activities, are more precise. / Les observations réalisées chez les patients cérébrolésés ainsi que le résultat des études d'imagerie cérébrale fonctionnelle convergent vers l'hypothèse selon laquelle le cortex pariétal postérieur (CPP) est impliqué dans le traitement des nombres et le calcul. Cependant, si les troubles du calcul résultent le plus souvent d'une lésion pariétale gauche, les résultats de certaines études d'imagerie fonctionnelle suggèrent que le CPP droit pourrait également jouer un rôle dans le traitement de la magnitude des nombres. Afin de clarifier cette question, nous avons utilisé la stimulation magnétique transcrânienne pour induire une lésion virtuelle du CPP gauche ou droit chez des sujets sains réalisant une tâche de comparaison de nombres. Nos résultats montrent que l'intégrité du CPP gauche est une condition nécessaire à la discrimination précise requise lors de la comparaison de nombres proches; la comparaison de nombres éloignés peut, quant à elle, être réalisée par l'un ou l'autre hémisphère comme le suggère le fait que cette tâche n'est affectée que par lésion virtuelle simultanée des deux hémisphères. Afin de mieux appréhender les processus sur lesquels s'appuient les compétences numériques du CPP, nous avons ensuite étudié les interactions possibles entre le traitement des nombres et les fonctions visuo-motrices. En effet, une méta-analyse réalisée sur des données d'imagerie fonctionelle a révélé que le traitement des nombres dépend de régions pariétales, mais également de certaines aires prémotrices, proches de celles impliquées dans le contrôle des mouvements des doigts. Dans une première série d'expériences, nous avons ainsi observé une augmentation de l'excitabilité des circuits moteurs lors du comptage de points présentés sur l'écran d'un ordinateur. Etant donné que la tâche de comptage était réalisée avec les mains au repos, cette augmentation a été interprétée comme le reflet d'une simulation mentale de mouvements de pointage ou d'extension séquentielle des doigts pendant le comptage. Dans une deuxième série d'expériences, nous avons montré que l'information relative à la magnitude des nombres pouvait interférer avec l'ouverture de la pince bidigitale requise pour saisir un objet. Ces résultats suggèrent que la conformation de la main adaptée à la taille des objets partage, avec la représentation des nombres, des processus communs d'estimation de la magnitude. En conclusion, notre travail supporte l'hypothèse selon laquelle nos capacités numériques pourraient, en partie du moins, reposer sur des fonctions visuo-motrices impliquant le CPP ; ceci pourrait expliquer pourquoi les capacités numériques de l'hémisphère gauche, dominant pour les activités motrices, sont plus précises.
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Kreitewolf, Jens. "Neural and behavioral interactions in the processing of speech and speaker information." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2015. http://dx.doi.org/10.18452/17247.

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Während wir Konversationen führen, senden wir akustische Signale, die nicht nur den Inhalt des Gesprächs betreffen, sondern auch eine Fülle an Informationen über den Sprecher liefern. Traditionellerweise wurden Sprachverständnis und Sprechererkennung als zwei voneinander unabhängige Prozesse betrachtet. Neuere Untersuchungen zeigen jedoch eine Integration in der Verarbeitung von Sprach- und Sprecher-Information. In dieser Dissertation liefere ich weitere empirische Evidenz dafür, dass Prozesse des Sprachverstehens und der Sprechererkennung auf neuronaler und behavioraler Ebene miteinander interagieren. In Studie 1 präsentiere ich die Ergebnisse eines Experiments, das funktionelle Magnetresonanztomographie (fMRT) nutzte, um die neuronalen Grundlagen des Sprachverstehens unter wechselnden Sprecherbedingungen zu untersuchen. Die Ergebnisse dieser Studie deuten auf einen neuronalen Mechanismus hin, der funktionelle Interaktionen zwischen sprach- und sprecher-sensitiven Arealen der linken und rechten Hirnhälfte nutzt, um das korrekte Verstehen von Sprache im Kontext von Sprecherwechseln zu gewährleisten. Dieser Mechanismus impliziert, dass die Sprachverarbeitung, einschließlich des Erkennens von linguistischer Prosodie, vornehmlich von Arealen der linken Hemisphäre unterstützt wird. In Studie 2 präsentiere ich zwei fMRT-Experimente, die die hemisphärische Lateralisierung der Erkennung von linguistischer Prosodie im Vergleich zur Erkennung der Sprachmitteilung respektive der Sprecheridentität untersuchten. Die Ergebnisse zeigten eine deutliche Beteiligung von Arealen in der linken Hirnhälfte, wenn linguistische Prosodie mit Sprecheridentität verglichen wurde. Studie 3 untersuchte, unter welchen Bedingungen Hörer von vorheriger Bekanntheit mit einem Sprecher profitieren. Die Ergebnisse legen nahe, dass Hörer akustische Sprecher-Information implizit während einer Sprach-Aufgabe lernen und dass sie diese Information nutzen, um ihr Sprachverständnis zu verbessern.
During natural conversation, we send rich acoustic signals that do not only determine the content of conversation but also provide a wealth of information about the person speaking. Traditionally, the question of how we understand speech has been studied separately from the question of how we recognize the person speaking either implicitly or explicitly assuming that speech and speaker recognition are two independent processes. Recent studies, however, suggest integration in the processing of speech and speaker information. In this thesis, I provide further empirical evidence that processes involved in the analysis of speech and speaker information interact on the neural and behavioral level. In Study 1, I present data from an experiment which used functional magnetic resonance imaging (fMRI) to investigate the neural basis for speech recognition under varying speaker conditions. The results of this study suggest a neural mechanism that exploits functional interactions between speech- and speaker-sensitive areas in left and right hemispheres to allow for robust speech recognition in the context of speaker variations. This mechanism assumes that speech recognition, including the recognition of linguistic prosody, predominantly involves areas in the left hemisphere. In Study 2, I present two fMRI experiments that investigated the hemispheric lateralization of linguistic prosody recognition in comparison to the recognition of the speech message and speaker identity, respectively. The results showed a clear left-lateralization when recognition of linguistic prosody was compared to speaker recognition. Study 3 investigated under which conditions listeners benefit from prior exposure to a speaker''s voice in speech recognition. The results suggest that listeners implicitly learn acoustic speaker information during a speech task and use such information to improve comprehension of speech in noise.
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Cherbuin, Nicolas. "Hemispheric interaction : when and why is yours better than mine? /." View thesis entry in Australian Digital Theses Program, 2005. http://thesis.anu.edu.au/public/adt-ANU20060317.135525/index.html.

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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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Hunt, Richard Jeffrey. "Ice-ocean-atmosphere interactions at high latitudes in the southern hemisphere." Thesis, University of Exeter, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307309.

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Eslaminejad, Ashkan. "Dynamical Modelling of an Idealized Hemispherical Skull Model with Fluid Pressure Interactions Using Modal Analysis." Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/29776.

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In this dissertation, a non-invasive intracranial pressure (ICP) monitoring technique is introduced by developing a head dynamic model. The technique is based on modal frequency testing and vibration responses analysis of the skull. To examine and verify this methodology, we conducted vibration tests on a hemispherical shell to stand as a surrogate for human cranium to measure the effect of cerebrospinal fluid (CSF) pressure on human skull dynamic response; we utilized a hammer-impact modal testing methodology on the simulated hemispherical shell to extract its dynamic response characteristics. To be able to examine the CSF-skull dynamics interactions, we measured the skull impulse responses using mechanical tensile tests at different strain rates. The modal analysis by finite elements eigenvalue analysis of the upper cranium skull model was conducted to find the material properties of the skull. Linear elastic, as well as, nonlinear hyperelastic material models were assumed for the skull to find its material parameters. In the simulation of the human head, the cranium was modeled as a closed clamped hemispherical aluminum shell under internal fluid pressure. The interactions of CSF with the simulated cranium were studied and the frequency responses were obtained at different interior pressures. A numerical procedure for dynamic analysis of the systems was developed to measure the modal frequencies of the setup. We examined the changes to the peaks of frequency response under different fluid pressure. The results of modal analyses demonstrate changes in the frequency of bending-wave vibration modes, while longitudinal-wave modes are nominally altered under variable pressure conditions. A single-degree of freedom vibrational model was also developed to fit to the data for the sensitive modes. Linear regression analysis of the results reveals that the dynamic model?s equivalent damping and stiffness parameters are sensitive to fluid pressure variations while the equivalent mass parameter is relatively unaffected. As a result of this study we conclude that variance in CSF pressure has a measurable effect on the dynamic characteristics of the cranium and vice-versa. A calibrating system to connect the dynamic changes of the head can stand as a non-invasive system for ICP changes.
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Roebuck, Tresa M. "Assessment of interhemispheric interaction in children with heavy prenatal alcohol exposure /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9980048.

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Hio, Yasuko. "Interannual Variations in the Structure and Interaction of Planetary Waves in the Southern Hemisphere Stratosphere." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147825.

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Books on the topic "Hemispheric interactions"

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University), International Rodin Remediation Conference (7th 1988 Wenner-Gren Center and Uppsala. Brain and reading: Structural and functional anomalies in developmental dyslexia with special reference to hemispheric interactions, memory functions, linguisticprocesses and visual analysis in reading. Basingstoke: Stockton, 1989.

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University), International Rodin Remediation Conference (7th 1988 Wenner-Gren Center and Uppsala. Brain and reading: Structural and functional anomalies in developmental dyslexia with special reference to hemispheric interactions, memory functions, linguistic processes, and visual analysis in reading : proceedings of the 7th International Rodin Remediation Conference at the Wenner-Gren Center, Stockholm and Uppsala University, June 19-22, 1988. Basingstoke, Hampshire: Macmillan, 1989.

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Young, Laurence R. Visual-vestibular interaction: Final report for NASA grant NAG 2-445. [Washington, DC: National Aeronautics and Space Administration, 1994.

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Young, Laurence R. Visual-vestibular interaction: Final report for NASA grant NAG 2-445. [Washington, DC: National Aeronautics and Space Administration, 1994.

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Young, Laurence R. Visual-vestibular interaction: Final report for NASA grant NAG 2-445. [Washington, DC: National Aeronautics and Space Administration, 1994.

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Era 5: Intensified Hemispheric Interactions 1000-1500 (ABC-Clio World History Encyclopedia). ABC-Clio, 2008.

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Lennerstrand, Gunnar, Curt Von Euler, International Rodin Remediation Conference 1988 Wenner-Gren Center an, and Ingvar Lundberg. Brain and Reading: Structural and Functional Anomalies in Developmental Dyslexia With Special Reference to Hemispheric Interactions, Memory Function (Wenner-Gren Center International Symposium Series). Stockton Pr, 1989.

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Buetefisch, Cathrin M., and Leonardo G. Cohen. Use-dependent changes in TMS measures. Edited by Charles M. Epstein, Eric M. Wassermann, and Ulf Ziemann. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780198568926.013.0018.

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Adult brains maintain the ability to reorganize throughout life. Cortical reorganization or plasticity includes modification of synaptic efficacy as well as neuronal networks that carry behavioural implications. Transcranial magnetic stimulation (TMS) allows for the study of primary motor cortex reorganization in humans. Motor-evoked potential (MEP) amplitudes change in response to practice. This article gives information about the effect of practice on TMS measures such as motor-evoked potential amplitudes, motor maps, paired-pulse measures, and behavioural measures. These changes may be accompanied by down-regulation of activity in nearby body part representations within the same hemisphere and in homonymous regions of the opposite hemisphere, mediated by interhemispheric interactions. There is evidence pointing towards the influence of practice on a distributed network of cortical representations within regions of cerebral hemispheres. This has lead to the formulation of intervention strategies to enhance the training effects by cortical or somatosensory stimulation in health and disease.
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World History Patterns of Interaction Unit 4 In-depth Resources Connecting Hemispheres. McDougal Littell, 2005.

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Studies of shock/shock interaction on smooth and transpiration-cooled hemispherical nosetips in hypersonic flow. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1992.

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Book chapters on the topic "Hemispheric interactions"

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Reggia, James A., Yuri Shkuro, and Natalia Shevtsova. "Computational Investigation of Hemispheric Specialization and Interactions." In Emergent Neural Computational Architectures Based on Neuroscience, 68–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44597-8_5.

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Zeevi, Yehoshua Y. "Hemispheric Interactions in Saccadic Responses to Bihemifield Stimuli." In Brain and Reading, 311–22. London: Macmillan Education UK, 1989. http://dx.doi.org/10.1007/978-1-349-10732-2_24.

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Mannucci, A. J., Bruce T. Tsurutani, Byron Iijima, Attila Komjathy, Brian Wilson, Xiaoqing Pi, Lawrence Sparks, et al. "Hemispheric daytime ionospheric response to intense solar wind forcing." In Inner Magnetosphere Interactions: New Perspectives From Imaging, 261–75. Washington, D. C.: American Geophysical Union, 2005. http://dx.doi.org/10.1029/159gm20.

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Kissin, Benjamin. "Psychological Defense Mechanisms as Interactions between Hierarchical and Hemispheric Functions." In Conscious and Unconscious Programs in the Brain, 235–47. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2187-3_16.

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Zaidel, Eran. "Hemispheric Independence and Interaction in Word Recognition." In Brain and Reading, 77–97. London: Macmillan Education UK, 1989. http://dx.doi.org/10.1007/978-1-349-10732-2_6.

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Melack, John M. "Interactions of detrital particulates and plankton." In Perspectives in Southern Hemisphere Limnology, 209–20. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5522-6_15.

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Steel, D. I., and W. J. Baggaley. "Meteoroid Orbits Determined by Southern Hemisphere Radar." In Properties and Interactions of Interplanetary Dust, 299–303. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5464-9_62.

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Doty, Robert W., Jeffrey D. Lewine, and James L. Ringo. "Mnemonic Interaction between and within Cerebral Hemispheres in Macaques." In Neural Mechanisms of Conditioning, 223–31. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2115-6_14.

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Whang, Mincheol, Jincheol Woo, and Jongwha Kim. "The Research on EEG Coherence Around Central Area of Left Hemisphere According to Grab Movement of Right Hand." In Human-Computer Interaction. Novel Interaction Methods and Techniques, 636–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02577-8_70.

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Peleg, Orna, Zohar Eviatar, Hananel Hazan, and Larry Manevitz. "Differences and Interactions Between Cerebral Hemispheres When Processing Ambiguous Words." In Attention in Cognitive Systems. Theories and Systems from an Interdisciplinary Viewpoint, 367–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-77343-6_24.

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Conference papers on the topic "Hemispheric interactions"

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Nikolaenko, Nikolay N. "Interaction of cerebral hemispheres and artistic thinking." In Photonics West '98 Electronic Imaging, edited by Bernice E. Rogowitz and Thrasyvoulos N. Pappas. SPIE, 1998. http://dx.doi.org/10.1117/12.320134.

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Nagashima, Tetsuya, Yoshiaki Nakamura, Michiru Yasuhara, and Kiyoshi Tsuboi. "Shock Interaction Induced by Two Hemisphere-Cylinders." In International Pacific Air & Space Technolgy Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1991. http://dx.doi.org/10.4271/912043.

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Stevenson, Andrew, Christopher Perez, and Roel Vertegaal. "An inflatable hemispherical multi-touch display." In TEI'11: Fifth International Conference on Tangible, Embedded, and Embodied Interaction. New York, NY, USA: ACM, 2010. http://dx.doi.org/10.1145/1935701.1935766.

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Hosseini, Amir Ehsan, Subir Bhattacharjee, and Eric M. V. Hoek. "Colloidal Interactions for Nanopatterned Surfaces Based on Surface Element Integration (SEI) Approach." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38781.

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In this study, van der Waals and electrostatic interaction energies on a nanopatterned rough surface was investigated. Surface element integration method (SEI) was applied to determine the interaction between a nanostructured substrate and an infinite flat plate. Hemispherical protrusions or depressions were mathematically generated on a square lattice to represent the rough surface. The size of the asperities and the pitch (separation) between their centers were varied. From the above calculations, we have analyzed the coupling between the range of the interactions and the roughness features of the substrate by comparing the ratios of the rough surface to smooth surface interaction energies per unit area. At small separations, the rough surface van der Waals interaction is seriously attenuated in the presence of protruding asperities. This attenuation is less pronounced for depressions. The attenuation of the van der Waals interaction due to asperities diminishes at large separations. In contrast, attenuation of the electrostatic interaction is independent of the separation.
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Kianvashrad, Nadia, and Doyle D. Knight. "Simulation of Hypersonic Shock-Shock Interaction over a Hemisphere." In 2018 Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-3708.

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Kianvashrad, Nadia, and Doyle D. Knight. "Shock-Shock Interaction over a Hemisphere in Hypersonic Flow." In AIAA Scitech 2019 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-0890.

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Knight, Doyle, Yuri Kolesnichenko, Vadim Brovkin, Valery Lashkov, and Igor Mashek. "Interaction of Microwave-Generated Plasma with Hemisphere-Cone-Cylinder." In 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-1005.

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"INTERACTIONS BETWEEN HEMISPHERES WHEN DISAMBIGUATING AMBIGUOUS HOMOGRAPH WORDS DURING SILENT READING." In International Conference on Neural Computation. SciTePress - Science and and Technology Publications, 2010. http://dx.doi.org/10.5220/0003059802710278.

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Kianvashrad, Nadia, and Doyle D. Knight. "Correction: Simulation of Hypersonic Shock-Shock Interaction over a Hemisphere." In 2018 Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-3708.c1.

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Kong, Dejuan, Anita Penkova, and Satwindar Singh Sadhal. "Oscillatory Flow Between Two Hemispheres for Shearing Protein Solution." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65663.

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Protein aggregation rate is known to be influenced by shear flow in protein solutions. This has important physiological implications as many of the body functions involve shear flow. Fluid mechanical shear can affect interactions between protein molecules, initiate protein aggregation, and further affect their biological activity. The shear rate is therefore an important parameter either to determine or to influence the properties of the protein solution when it forms a nucleus or aggregates. For experiments, the number density of nuclei can be controlled by using an optimal shear rate and protein concentration. However, this requires theoretical information on the shear rate for the experimental conditions. With this motivation, we have designed an experiment in which we can effectively apply shear with flow characteristics that can be calculated. Specifically, in a small hemispherically-shaped bowl, 4 mm in diameter we place the protein solution and insert a rounded rod that can be vibrated rotationally or laterally, maintaining spherical symmetry in the liquid region. This system is particularly useful when only small quantities of expensive protein solutions can be used for experimentation. We have carried out the mathematical analysis of the time-dependent flow field between two concentric hemispheres by the perturbation method using ε = U0/ωa ≪ 1 as a small parameter where U0 is a characteristic velocity, ω is the oscillation frequency and a is a length scale based on the vessel dimensions (bowl radius). We have obtained an analytical solution for the velocity field, and the shear rate in the liquid. In addition, with the nonlinear interaction of the oscillatory flow, there is a nonzero time-independent mean flow (known as streaming). With the integrated effect of shear in the liquid region, this result will be useful for conducting aggregation experiment in which the effective shear rate can be correlated to the aggregation rate.
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