Comparison of caudate nucleus and septal-area lesions on two types of avoidance behavior.

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Abstract
Previous studies implicate the caudate nucleus as a subcortical mediating structure for frontal and anterior limbic inhibitory effects. On active and passive avoidance tasks caudate-lesioned cats were significantly deficient in ability to inhibit an instrumental feeding response following shock at the food dish but showed normal acquisition of a shuttle-box avoidance response. Septal-area lesioned cats clearly failed to inhibit the passive avoidance response but, in contrast to the caudate group, showed more rapid acquisition of the active avoidance response than did the normal controls. Findings are related to earlier studies of effects of perigenual lesions on these 2 types of avoidance response, and a possible anatomical basis for the present findings is discussed.

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