Hemispheric dominance for speech and calculation: electrophysiologic correlates of left dominance in left handedness |
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Authors: | R Jung E Altenmüller B Natsch |
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Institution: | Abteilung Neurophysiologie der Universita¨t Freiburg i.Br.,B.R.D. |
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Abstract: | Slow brain potentials were recorded in left-handers and right-handers during: (i) processing of language and mental arithmetic tasks, without vocalization, and (ii) subsequent writing down of the answers with either the right or left hand. Left-sided laterality of negative potentials was taken as evidence of hemispheric dominance. It appeared during the processing of words and numbers in 26 of the 30 left-handers and was localized mainly in the left frontal and temporal parietal regions. Similar results were found with the right-handers. This electrophysiological evidence indicates that the left hemisphere is dominant for language and calculation in the vast majority of left-handers. Only when writing with either their left or right hand do left-handers show less left-sided laterality than right-handers. |
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