Differential effects of environmental enrichment on the open-field behavior of wild and domestic Norway rats.

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Abstract
Early postweaning experience in an enriched environment had a greater influence on the open-field behavior and body weight of 32 wild Norway rats than of their 32 counterparts. Genetic changes accompanying the domestication process may have reduced the relative impact of postweaning experience on the development of the domestic S's response to changes in its environment. (28 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)