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Postsession strychnine injections have been shown to retard acquisition rates of the classically conditioned nictitating membrane response (CCNMR) of rabbits trained at a CS-US interval of 1000 msec. The particular interval value employed in CCNMR acquisition was found to be important in the magnitude of the postsession strychnine effect. Strychnine Ss trained at a CS-US interval=1250 msec (nonoptimal) were significantly depressed in acquisition rates relative to saline controls, while strychnine Ss trained at a CS-US interval=250 msec (optimal) were not. Interpretations are based upon the presumed effects of CNS excitants on memory consolidation and possible neurological correlates of the CS-US interval parameter

Experimental variables in the effects of postsession injections of strychnine sulphate on a classically conditioned response