Reinforcing effects of manipulation in mice.

Abstract
Nondeprived mice were tested in a box containing a lever, which was rigid for one group and movable for the other. The movable bar produced longer durations of separate contacts, without changing the number of contacts. The results are felt to support the hypothesis that any environmental change may be reinforcing. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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