Thirty rats divided into two equal groups were run in a 3-ft. long runway under conditions of food deprivation. After 24 trials, the motivation was reversed for both groups, the low-drive group which had been fed immediately before training was now fed after the training, the high-drive group which had been fed following the daily training was now fed first and then trained. Performance was measured in terms of response latency. S's trained under low drive attained the level of performance of the high drive group immediately after being placed on high drive. The performance of the high-drive group did not change significantly when they were switched to low drive. (PsycINFO Database Record (c) 2006 APA, all rights reserved)