Negative contrast as a function of the interval between preshift and postshift training

Abstract

Rats were trained to lick either 32% or 4% sucrose solutions for 5 min per day. Following 10 days of acquisition training, the 32% rats were shifted to the 4% solution. A negative contrast effect was found with a 1-day but not with a 32-day retention interval interposed between the shift phases. An attempt to reinstate the memory of the 32% solution in the 32-day retention condition prior to the first postshift test failed to affect postshift licking behavior.