Abstract
The EEG was recorded over left and right hemispheres (P3-C3, P4-C4, P3-O1, P4-O2) in 41 subjects, 32 of whom were known to be dextral and 7 sinistral. Amplitude histograms were computed of both total EEG and its filtered alpha component for four conditions: eyes closed, relaxed; eyes open, relaxed; eyes closed, doing mental arithmetic; eyes open, doing mental arithmetic. Over all subjects the total EEG occurred with lower mean amplitude over the left hemisphere in all experimental conditions. However, its alpha component was symmetrically distributed while subjects were relaxed, but suppressed more over the left than the right while subjects undertook mental arithmetic. This asymmetry was found to be due to the dextrals in the sample, and absent for the sinistral group taken as a whole. The results are interpreted in terms of the specialization of the left hemisphere in dextrals for verbally mediated tasks.
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