Effects of a classical conditioned ‘fear signal’ and ‘safety signal’ on nondiscriminated avoidance behavior

Abstract

Rats were trained to avoid shock on a Sidman schedule in a shuttle apparatus; then they were tested with a probe stimulus that in a Pavlovian session for different groups signalled shock, or absence of shock. The danger signal increased the rate of avoidance responding and the safety signal decreased it. Two control procedures are compared. © 1968, Psychonomic Journals. All rights reserved.