Abstract
Nine pigeons were exposed to a matching-to-sample task in which the reinforcer delay was varied. Specific sample stimulus, comparison stimulus, and reinforcement conditional probabilities were used to establish different structural sequences. Pigeons were assigned to three different groups. Reinforcer delays for the three groups were 3 s and 1 s for group 1, 2 s for group 2, and 0 s for group 3. Pigeons in group 1 performed similarly to those in group 3, while those in group 2 performed most poorly. These data indicate that matching-to-sample performance may be enhanced by different structural sequences even when the element that makes the difference—reinforcer delay—has been previously reported as having a negative effect on matching accuracy.
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