Journal
EXPERIMENTAL BRAIN RESEARCH
Volume 197, Issue 4, Pages 403-408Publisher
SPRINGER
DOI: 10.1007/s00221-009-1922-2
Keywords
Handedness; Sensory feedback; Proprioception; Task complexity; Kinesthesis; Upper limb; Laterality
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In right-handers, the ability to reproduce proprioceptive targets has been shown to be asymmetric, favoring the non-preferred left arm. The present study sought to determine whether a similar arm/hemisphere asymmetry exists for left-handers. Ten strong left-handed adults used the left or right arm to perform proprioceptive target matching tasks that varied in processing demands (i.e., need for memory, interhemispheric transfer) and target amplitude (20, 40A degrees). Similar to right-handers, left-handed individuals had smaller total errors when matching with the non-preferred arm. This asymmetry was greatest in conditions with increased processing demands and larger amplitude targets. These results provide the first evidence to date of right arm/left hemisphere dominance for proprioceptive target matching in left-handers that is the mirror image of right-handers.
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