Abstract
Open-field behavior was examined under several conditions in isolation-reared, and socially reared, Fawn Hooded (FH) and Wistar rats. Lighting conditions (red or white light) and complexity (object or no object) were varied: Experiment 1, white light, no object; Experiment 2, red light, no object; Experiment 3, white light, object; Experiment 4, red light, object. The plasma corticosterone (CORT) response to open-field exposure was examined two further experiments. Observation of differences in open-field behavior, resulting from strain or rearing condition, was dependent on both lighting condition and complexity. Differences in exploratory behavior exhibited by isolation-reared rats were best explained by changes in response to novelty, while those in FH, relative to Wistar, rats were primarily due to increased anxiety. Supporting these conclusions, FH rats had enhanced stimulated CORT levels, while isolation rearing was without effect.
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