“…A great degree of similarity is hence postulated for appetitive and aversive behaviour; consequently, both may be based on similar learning mechanisms (Cándido, Maldonado, & Vila, 1989;Dickinson, 1980;Toates, 1986). One experimental strategy to test this hypothesis has been to use avoidance learning to search for effects similar to those traditionally obtained in appetitive instrumental conditioning (Daly & Daly, 1987;Denny, 1991;Gray, 1987;Masterson & Crawford, 1982;McAllister, McAllister, Brooks, & Goldman, 1972;Morris, 1975;Overmier, 1979).…”