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Investigating the effects of handedness on the consistency of lateralization for speech production and semantic processing tasks using functional transcranial Doppler sonography
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Bruckert, L., Thompson, Paul A., Watkins, K. E., Bishop, D. V. M. (Dorothy V. M.) and Woodhead, Z. V. J. (2021) Investigating the effects of handedness on the consistency of lateralization for speech production and semantic processing tasks using functional transcranial Doppler sonography. Laterality : Asymmetries of Body, Brain and Cognition, 26 (6). pp. 680-705. doi:10.1080/1357650X.2021.1898416
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WRAP-investigating-effects-handedness-consistency-lateralization-speech-production-semantic-processing-tasks-using-functional-transcranial-Doppler-Thompson-2021.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (3260Kb) | Preview |
Official URL: https://doi.org/10.1080/1357650X.2021.1898416
Abstract
The left hemisphere is dominant for language in most people, but lateralization strength varies between different tasks and individuals. A large body of literature has shown that handedness is associated with lateralization: left handers have weaker language lateralization on average, and a greater incidence of atypical (right hemisphere) lateralization; but typically, these studies have relied on a single measure of language lateralization. Here we consider the relationships between lateralization for two different language tasks. We investigated the influence of handedness on lateralization using functional transcranial Doppler sonography (fTCD), using an existing dataset (N = 151 adults, 21 left handed). We compared a speech production task (word generation) and a semantic association task. We demonstrated stronger left-lateralization for word generation than semantic association; and a moderate correlation between laterality indices for the two tasks (r = 0.59). Laterality indices were stronger for right than left handers, and left handers were more likely than right handers to have atypical (right hemisphere) lateralization or inconsistent lateralization between the two tasks. These results add to our knowledge of individual differences in lateralization and support the view that language lateralization is multifactorial rather than unitary.
| Item Type: | Journal Article | |||||||||
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| Subjects: | B Philosophy. Psychology. Religion > BF Psychology Q Science > QP Physiology R Medicine > RC Internal medicine |
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| Divisions: | Faculty of Social Sciences > Centre for Educational Development, Appraisal and Research (CEDAR) | |||||||||
| Library of Congress Subject Headings (LCSH): | Cerebral dominance, Laterality , Left- and right-handedness , Transcranial Doppler ultrasonography, Speech perception | |||||||||
| Journal or Publication Title: | Laterality : Asymmetries of Body, Brain and Cognition | |||||||||
| Publisher: | Taylor & Francis | |||||||||
| ISSN: | 1357-650X | |||||||||
| Official Date: | 2021 | |||||||||
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| Volume: | 26 | |||||||||
| Number: | 6 | |||||||||
| Page Range: | pp. 680-705 | |||||||||
| DOI: | 10.1080/1357650X.2021.1898416 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access | |||||||||
| RIOXX Funder/Project Grant: |
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