STUDIES ON SUBCORTICAL MOTOR ACTIVITY. I. MOTOR ACTIVITY AND INHIBITION FROM IDENTICAL ANATOMICAL POINTS

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Abstract
Studies were carried out in 3 series of cats utilizing the stereotaxic technique. Points in the forebrains of cats which with stimulation of 2/second produced motor responses were found to coincide with another series of points which produced inhibition of cortically evoked movement at a stimulus frequency of 100/second. Stimulation of these same points in chronic sensori-motor decorticated animals was ineffective. Careful calibration of stimulation intensity showed the lowest threshold for both effects to lie in the internal capsule. It is concluded that the effects described here in all cases were due either to direct stimulation of or stimulus spread to the internal capsule.

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