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ERIC Number: EJ862807
Record Type: Journal
Publication Date: 2009-Dec
Pages: 8
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0028-3932
Hand Preference for Precision Grasping Predicts Language Lateralization
Gonzalez, Claudia L. R.; Goodale, Melvyn A.
Neuropsychologia, v47 n14 p3182-3189 Dec 2009
We investigated whether or not there is a relationship between hand preference for grasping and hemispheric dominance for language--and how each of these is related to other traditional measures of handedness. To do this we asked right- and left-handed participants to put together two different sets of 3D puzzles made out of big or very small LEGO[C] pieces. Participants were also given two self-reported handedness questionnaires, as well as tests of grip force and finger tapping speed. A language lateralization (dichotic listening) test was also administered. We found a positive correlation between hand use for precision grasping and language lateralization (i.e. the more participants used their right hand for grasping the small LEGO[C] pieces, the more language was lateralized to the left hemisphere). In addition, we identified two populations of left-handers according to their grasping performance: "left-right-handers", who behaved exactly like right-handers; and "left-left-handers" whose performance was the mirror image of that of right-handers. Finally, we found an increase in right-hand use when right-handers and "left-right-handers" had to pick up the small LEGO[C] pieces. We discuss our results in relation to recent notions of left-hemisphere specialization for visually guided actions and its relationship with the evolution of language. (Contains 4 figures and 2 tables.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A