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Abstract
Two pigeons were trained on the two-choice ambiguous-cue problem that contained two types of trials. On PA trials, choice of P (the positive stimulus) is reinforced and choice of A (the ambiguous stimulus) is not reinforced; on NA trials, choice of A is reinforced and choice of N (the negative stimulus) is not reinforced. Under the various across-trial fixed-ratio (FR) schedules of reinforcement, NA performance remained superior to PA performance. PA performance was poorer under FR 12 than FR 1; NA performance, however, was not affected by the size of the FR. Similarly, only PA performance showed any change as a function of the trial’s location within the ratio—it was poorest early in the ratio.
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