INTERACTION IN BILATERALLY SIMULTANEOUS VOLUNTARY MOTOR FUNCTION

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Abstract
IT IS NOW well recognized in the sphere of sensory perception that percepts as determined by a single stimulus may be altered, or even obliterated, when disparate multiple stimuli are simultaneously applied to various regions of the soma.1This phenomenon has been demonstrated most clearly in the modalities of vision, audition and general cutaneous sensory function. It has also been observed that under certain conditions a unilateral Babinski sign can be obliterated with bilateral simultaneous plantar stimulation2; occasionally bilateral simultaneous plantar stimulation is also seen to enhance a weak or equivocal unilateral Babinski sign. In the sphere of voluntary executive function interaction influences have not yet been specifically demonstrated. The purpose of this presentation is to show that interaction in the motor sphere does occur and can be demonstrated by suitable means. Succession movements, or the diadokokinetic action of Babinski,3lend themselves admirably to the study of
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