Abstract
Arm movements were both videotyped and recorded with potentiometers attached to the arms, during speaking. Flexion-extension and supination-pronation were compared in detail in left and right arms during free movements made bilaterally or with one arm at a time. The right arm was found to make more direction changes per movement than the left arm, but no differences in onset or termination time, or in duration of movement were found. The results are discussed in terms of the nature of left-hemisphere control of left and right arms in proximal free movement.
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