Recovery from one-trial overshadowing.

Prevailing models of associative learning can all account for multitrial overshadowing. However, they fail to account for one-trial overshadowing, which is ordinarily explained in terms of distraction of the subject by the more salient of two simultaneously trained cues from the less salient cue, which interferes with associative acquisition. In the present study, we demonstrate that recovery from overshadowing can be obtained through two techniques that have previously been found to restore responding to overshadowed cues in multitrial training situations. Specifically, recovery from one-trial overshadowing was obtained by extinguishing the overshadowing stimulus and also by administering a posttraining reminder treatment consisting of brief exposure to the overshadowed cue. The similarity of these observations to those in multitrial overshadowing suggests that one-trial and multitrial overshadowing arise from a common underlying mechanism and further augments the view that all cue competition is due (at least in part) to a failure to express acquired information, rather than to a failure to learn.