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Abstract
The cortical potentials preceding movement, negative slope (NS'), premovement positivity
(PMP), and the initial slope of motor potential (MP), were studied in detail with
a 29-channel averaged EEG mapping technique in normal subjects. Self-paced, voluntary
movements of the right and left index fingers were performed up to 150 times, and
topographic color maps were created from the averaged wave forms. The maps revealed
NS' of the dominant hand on the vertex and NS' of the non-dominant hand on the contralateral
centroparietal area. PMP appeared on the ipsilateral precentral area, and the initial
slope of MP appeared on a small, distinct contralateral precentral area, presumably
the hand motor area. The amplitudes of the potentials did not show significant differences
between dominant and non-dominant hands. PMP and the initial slope of MP appeared
significantly earlier preceding non-dominant hand movement as compared with dominant
movement. The findings indicate some difference in cortical activity relating to dominant
and non-dominant hand movement.