| Abstract: | Rats in a flavor aversion procedure were used to examine the extent to which an extinguished CS can pass a retardation and summation test for conditioned inhibition after either a short or a long retention interval. Rats were given a single pairing of a flavored solution with LiCl, and then received a large number of CS-alone extinction trials. Following extinction, some subjects received a 3-week retention interval following extinction while others did not. Extinction produced evidence of conditioned inhibition on both tests when a short retention interval occurred following extinction. However, conditioned inhibition was attenuated by the long retention interval when assessed with a retardation test, but no effect of the long retention interval was observed when inhibition was evaluated with a summation test. |
