Remembering as discrimination in delayed matching to sample: Discriminability and bias |
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| Authors: | Rebecca J Sargisson K Geoffrey White |
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| Institution: | (1) Department of Psychology, University of Otago, Dunedin, New Zealand; |
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| Abstract: | Task difficulty in delayed matching-to-sample tasks (DMTS) is increased by increasing the length of a retention interval.
When tasks become more difficult, choice behavior becomes more susceptible to bias produced by unequal reinforcer ratios.
Delaying reinforcement from choice behavior also increases both task difficulty and the biasing effect of unequal reinforcer
probability. Six pigeons completed nine DMTS conditions with retention intervals of 0, 2, 4, 6, and 8 sec, in which reinforcer
delays of 0, 2, and 4 sec were combined with ratios of reinforcer probabilities of .5/.5, .2/.8, and .8/.2 for correct red
and green responses. Discriminability (logd) decreased with both increasing retention interval duration and increasing reinforcer delay. Sensitivity to reinforcement,
the tendency for ratios of choice responses to follow unequal reinforcer probabilities, also increased as a function of both
increasing retention interval and increasing reinforcer delay. The result is consistent with the view that remembering in
DMTS tasks is a discriminated operant in which increasing task difficulty increases sensitivity to reinforcement. |
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