Effects of caudate lesions on signaled and nonsignaled Sidman avoidance in the rat.

Rats with caudate lesions were clearly deficient on a nonsignaled Sidman avoidance schedule when compared with both normal subjects and subjects with cortical control lesions. Caudate subjects responded at lower rates, avoided a lower percentage of shocks, and failed to develop a temporal discrimination. In contrast with its effects upon normals and controls, the addition of a 5-sec warning cue failed to improve the performance of the caudate subjects.

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