Journal
NEUROREPORT
Volume 13, Issue 15, Pages 1929-1932Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00001756-200210280-00020
Keywords
brain mapping; event-related potential; hemispheric dominance; laterality; mental rotation; sex differences
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We assessed lateralization of brain function during mental rotation, measuring the scalp distribution of a 400-600 ms latency event-related potential (ERP) with 128 recording electrodes. Twenty-four subjects, consisting of equal numbers of dextral and sinistral males and females, performed a mental rotation task under two response conditions (dominant vs non-dominant hand). For males, ERPs showed a right parietal bias regardless of response hand. For females, the parietal ERPs were slightly left-lateralized when making dominant hand responses, but strongly right-lateralized when making non-dominant hand responses. These results support the notion that visuo-spatial processing is more bilaterally organized in females. However, left hemisphere resources may be allocated to response preparation when using the non-dominant hand, forcing visuo-spatial processing to the right hemisphere.
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