Hemispheric asymmetry of hand and tool perception in left- and right-handers with known language dominance

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

Fersiynau electronig

Dogfennau

  • Karlsson_Carey_manuscript

    Llawysgrif awdur wedi’i dderbyn, 721 KB, dogfen-PDF

    Embargo yn dod i ben: 29/08/25

    Trwydded: CC BY-NC-ND Dangos trwydded

Dangosydd eitem ddigidol (DOI)

Regions in the brain that are selective for images of hands and tools have been suggested to be lateralised to the left hemisphere of right-handed individuals. In left-handers, many functions related to tool use or tool pantomime may also depend more on the left hemisphere. This result seems surprising, given that the dominant hand of these individuals is controlled by the right hemisphere. One explanation is that the left hemisphere is dominant for speech and language in the majority of left-handers, suggesting a supraordinate control system for complex motor sequencing that is required for skilled tool use, as well as for speech. In the present study, we examine if this left-hemispheric specialisation extends to perception of hands and tools in left- and right-handed individuals. We, crucially, also include a group of left-handers with right-hemispheric language dominance to examine their asymmetry biases. The results suggest that tools lateralise to the left hemisphere in most right-handed individuals with left-hemispheric language dominance. Tools also lateralise to the language dominant hemisphere in right-hemispheric language dominant left-handers, but the result for left-hemispheric language dominant left-handers are more varied, and no clear bias towards one hemisphere is found. Hands did not show a group-level asymmetry pattern in any of the groups. These results suggest a more complex picture regarding hemispheric overlap of hand and tool representations, and that visual appearance of tools may be driven in part by both language dominance and the hemisphere which controls the motor-dominant hand. [Abstract copyright: Copyright © 2024 Elsevier Ltd. All rights reserved.]

Allweddeiriau

Iaith wreiddiolSaesneg
Rhif yr erthygl108837
Tudalennau (o-i)108837
CyfnodolynNeuropsychologia
Cyfrol196
Rhif y cyfnodolynApril
Dyddiad ar-lein cynnar29 Chwef 2024
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 15 Ebr 2024
Gweld graff cysylltiadau