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Preshift Reward Magnitude and Positive Contrast in the Rat

Roger L. Mellgren, Jeffrey A. Seybert, Dan M. Wrather and Dennis G. Dyck
The American Journal of Psychology
Vol. 86, No. 2 (Jun., 1973), pp. 383-387
DOI: 10.2307/1421448
Stable URL: http://www.jstor.org/stable/1421448
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preshift Reward Magnitude and Positive Contrast in the Rat
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Abstract

Four groups of rats were given 24 trials of training in a straight runway with 1, 2, 4, or 8 food pellets, and then shifted to 8 pellets. There was a 20-sec delay of reinforcement on each trial, to prevent a ceiling effect on running speeds. The three shifted groups showed stable positive contrast relative to the unshifted control group. Postshift running speed was inversely related to magnitude of preshift reward.

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