Brief periods of socialization and later behavior in the rat

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Abstract

Abstract Juvenile rats were allowed short daily periods of social contact to see if this would reduce the known effects of isolation rearing upon habituation of locomotor activity and object contact in the open field. Animals totally deprived of social experience (ISOL) were slower to habituate than animals living in small social groups (SOC). Rats allowed 1 hr of social contact (partial isolates, PI), but living otherwise in isolation, were intermediate between ISOL and SOC animals. In further experiments the quality of social interactions in the daily period was altered by drugging one of the partners, either with amphetamine or with chlorpormazine. In later tests in the open field, the rats that had interacted with amphetamine‐injected or chlorpromazine‐injected partners differed from PI animals in the direction of resembling complete isolates (ISOL); this was particularly true of those paired with amphetamine animals. Observation revealed that injection of 1 of the partners considerably altered social interactions in the pair. A further test showed that 1 hr of contact a day considerably alleviated the deleterious effects of isolation rearing upon response reversal. We conclude that normal development in the rat may depend upon the flexibility of behavior encouraged by the early social situation.

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