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February 1959

Interaction in Simultaneous Motor Functions

Author Affiliations

Warsaw, Poland

AMA Arch NeurPsych. 1959;81(2):173-181. doi:10.1001/archneurpsyc.1959.02340140039005

Introduction  Healthy persons are generally known to have a strong tendency toward symmetry of movements carried out simultaneously with the two upper extremities. Dissimilar movements, carried out simultaneously with the left and the right hand, entail a considerable effort, which is not always effective. This is a common observation in everyday life and in many tests used by psychologists or neurologists, for example, the motor test of Ozerecki.1 It is a natural and common tendency to perform the same function with both hands. The phenomenon is of interest from the point of view of interaction of simultaneous kinesthetic stimuli from symmetrical extremities, and from that of reciprocal relations between them.In neurological clinics, however, an additional problem is presented, namely, the kind of interaction between two motor functions performed by a person whose one hand is defective while the other one is healthy, whereby a motor action uniformly intended

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