Abstract
In Exp. 1 rats were given 5 training trials per day for 8 days in a straight runway under both low and high drive, with the drive state of each subject altered each day. Subjects were subdivided and given 20 extinction trials under either low or high drive. Exp. 2 replicated the training conditions of Exp. 1, but, in addition, lengthened training sessions to 18 days and extinguished each subject under both low and high drive. Combined results showed residual effects of intensity of drive state on the first day of training upon later training trials; however, with additional training the effect dissipated. Data were interpreted as supportive of the position that drive contributes to habit strength.