Colour versus quantity as cues in reverse-reward-competent squirrel monkeys (Saimiri sciureus) |
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Authors: | Anderson James R Awazu Shunji Fujita Kazuo |
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Institution: | Department of Psychology, University of Stirling, Stirling, UK. jra1@stir.ac.uk |
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Abstract: | To assess the relative salience of colour and quantity cues, squirrel monkeys previously trained to reach for the smaller of two quantities of food in a reverse-reward contingency task received colour discrimination training. After initial failure to discriminate between two colours of dots under a differential reinforcement regime, they learned the task when the S- colour was associated with zero reward. The monkeys then showed good retention on the original reverse-reward task of 1 versus 4 with pairs of dots presented in S+ or S- colours. However, on "mismatch" trials of 1S- versus 4S+ , only 2 of 4 monkeys tested showed a preference--1 monkey chose based on quantity, the other based on colour. Individual differences and the possible roles of overshadowing and blocking are discussed. |
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