Abstract
MSH/ACTH 4–10 induces a dose dependent increase of latency scores during retention of a passive avoidance response, when injected SC prior to retention but not when administered immediately after the learning trial. Intracerebroventricular administration of anti-vasopressin serum immediately after the learning trial or 1 hr prior to retention induces marked deficits in passive avoidance behavior as indicated by low latencies during retention. SC injection of MSH/ACTH 4–10 increased latency scores in animals which received anti-vasopressin serum prior to retention, but did not alter latencies in animals, which received anti-vasopressin serum after the learning trial. These results suggest that MSH/ACTH 4–10 is involved in retrieval processes and is able to differentiate between the effects of vasopressin on memory consolidation and on retrieval.
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