INHIBITION OF NONSPECIFIC SENSORY ACTIVITIES FOLLOWING STRIOPALLIDAL AND CAPSULAR STIMULATION

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Abstract
In cats anesthetized with chloralose and immobilized with FlaxediL the stimulation of circumscribed striopallidal and capsular zones selectively inhibited the peripherally evoked potentials of the association cortex. Sensory-specific evoked potentials were not affected. The inhibition was bilateral, its duration about 350 msec, and the inhibiting stimulus alone produced no cortical responses. The parameters of the inhibitory stimulation were studied and the effective sites mapped. The inhibition could still be elicited following acute and chronic ablations but it was blocked by the intravenous administration of 0.1 mg/kg strychnine. The authors suggest a postsynaptic inhibition of striopallidal origin.