Evidence for a shift in the choice criterion of rats in a 12-arm radial maze |
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Authors: | Michael F Brown Evangeline A Wheeler Donald A Riley |
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Institution: | 1. Department of Psychology, Villanova University, 19085, Villanova, PA 2. University of California, Berkeley, California
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Abstract: | Rats were trained in a standard 12-arm radial maze task. Following training, each trial consisted of a sequence of 2, 4, 6, 8, or 10 choices, followed by a 15-min delay, which then was followed by a choice between a single arm and a response manipulandum mounted in the center of the maze. An arm visit was reinforced if the arm had not been visited prior to the delay, whereas a manipulandum response was reinforced if the arm had been visited. It was found that rats are relatively more likely to reject arms by responding to the manipulandum following a delay occurring late in the choice sequence. This indicates that the choice criterion used by rats in the radial maze becomes more strict as the choice sequence progresses. Such a process provides an alternative explanation for some of the data recently reported by Cook, Brown, and Riley (1985). |
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