Abstract
8 measures recorded during alternate tapping of two targets by left and right hands for 15 boys, 13 or 14 yr. old, were made during 4 30-sec. trials using a force averaging 450 gm. Mechanical and electrical activity (EMG from m. biceps brachii) of both hands suggested asymmetric characteristics of the two hands and the likely involvement of different types of muscle fibers or asymmetry of the CNS.
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