The effects of distinctive cues on delayed-reward learning were investigated by pretraining 2 groups of rats in a Skinner box on either a CRF or a FR10 schedule. A light was paired with each bar press. Ss were then run in a straight-alley runway for 16 trials with a 30-sec. delay interval. A light was paired with the delay. A 2 × 3 analysis of variance (2 treatments × 3 blocks of 5 trials) indicated that the FR10 group ran significantly slower. The results were discussed in terms of Amsel's (1958) frustration hypothesis.
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