Summary Three groups of male albino rats (10-4C, 4-4, and 0-4C) were given 80 acquisition trials in a double runway (total N = 60). Subsequent to acquisition training, Ss in Group 4-4 were subdivided into four groups (10-4E, 4-4E, 10-4S, and 4-4C) and all six groups were given 20 additional test trials. For each group, the first number corresponds to the number of Noyes food pellets received in the first goalbox, while the second number corresponds to the number of pellets received in the second goalbox. The letters, C, E, and S refer to the Control, Experimental, and Shifted reward groups, respectively. During test trials, the E groups received rewarded (nonfrustration) and nonrewarded (frustration) trials on a random basis, whereas the S group was shifted to a larger magnitude of continuous reward in the first goalbox. The C groups continued as in acquisition training. During frustration trials, run speeds in Alley 2 were faster for Group 10-4E than for Group 4-4E. Group 4-4E was in turn superior to Gro...