Abstract
Rats were reared from weaning either in isolation or in social groups for 10 weeks and were then tested for the acquisition of schedule-induced polydipsia (SIP). Isolation-reared rats were impaired in the development of this behaviour when compared to socially-reared controls. This reduction in drinking was specific to this test situation. Home cage water consumption and drinking in the SIP test chamber without a schedule of food delivery were unaltered and home cage drinking following water deprivation was significantly higher in the isolates. Housing adult rats in isolation did not impair SIP. The locomotor hyperactivity induced by isolation was also specific to rearing conditions. The inverse relationship between water consumption on the last day of testing and plasma corticosterone levels observed in both the socially-reared and socially-housed rats was absent in both the isolation-reared and isolation-housed rats.
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