After bar training, 3 of 5 groups of 9 rats received runway discrimination training presenting a buzzer as the discriminative stimulus: I—in the start box; II—in the alley; III—as the goal box was entered. For Group IV the buzzer sounded after the reward was seized and Group V was not exposed to the buzzer. After Group I attained the criterion of discrimination, Ss were tested in the Skinner box with bar depression sounding the buzzer for .75 sec. Contrary to the hypothesis that all discriminative stimuli are secondary reinforcers (Keller & Schoenfeld, 1950), there was no evidence that the buzzer had acquired reward value.
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