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Journal Article

Imitation, Social Facilitation, and the Effects of ACTH 4-10 on Rats' Bar-Pressing Behavior

James M. Henning and Thomas R. Zentall
The American Journal of Psychology
Vol. 94, No. 1 (Mar., 1981), pp. 125-134
DOI: 10.2307/1422347
Stable URL: http://www.jstor.org/stable/1422347
Page Count: 10
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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.
Imitation, Social Facilitation, and the Effects of ACTH 4-10 on Rats' Bar-Pressing Behavior
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Abstract

The effects of ACTH 4-10 on rats' imitation learning was examined during the acquisition and extinction of a bar-press response for water reinforcement. Rats were exposed to either a bar-pressing conspecific (OB), an experimentally naive conspecific (ON), or an empty box (OE) during bar-press acquisition. In a factorial design, each rat was then exposed to one of the same three conditions during extinction. An 80 mcg dose of ACTH 4-10 was administered to half of the rats in each group prior to observation. Performance differences during acquisition were generally small, but significant performance differences during extinction were found. Social facilitation was indicated by the finding that rats extinguished in the presence of a conspecific exhibited significantly greater resistance to extinction than rats extinguished in the presence of an empty box. An imitation effect was also found. Rats that observed a bar-pressing conspecific during both acquisition and extinction (group OB-OB) showed significantly greater resistance to extinction than did groups OB-ON, OB-OE, or OE-OE. There were no significant effects of the hormone, however, relative to saline controls.

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