1973 Volume 15 Issue 4 Pages 173-178
Rats were either avoidance or approach trained in a situation in which responses in a variety of directions were relatively free to occur. The training was continued until the response speed of the approach behavior became faster than that of the avoidance behavior. Then the approach group was subdivided into two groups differing in hunger drive. The variability of the slower avoidance behavior was significantly less than that of the faster approach behavior. The findings gave farther support of the conclusion that the rigidity of behavior was an intrinsic nature of fear-motivated behavior and not simply a function of the drive strength as indexed by response speed.