Infantile handling eliminates reversal learning deficit in rats prenatally exposed to alcohol

Prenatal exposure to ethanol results in learning deficits and alters physiological response to stress. Neonatal handling and stimulation, on the other hand, produce long-lasting physiological and behavioral changes in response to stress. To determine whether early handling, consisting of daily separation and tactile stimulation for the first 3 weeks, can modify fetal alcohol effects on learning ability of young adult rats, offspring of rats chronically exposed to ethanol throughout pregnancy and control animals were trained in a T-maze to learn a position response and then to reverse the learned response. The nonhandled, ethanol-treated rats were deficient on reversal, but the ethanol-treated rats that were handled during the first 3 weeks of postnatal development showed no deficit in learning to reverse their previously learned responses. Postnatal handling had no effect on acquisition in alcohol-treated rats. Neither reversal nor acquisition was affected by infantile handling in pair-fed or normal control animals. Early handling map have eliminated the reversal deficit in the ethanol-treated offspring by altering their physiological and behavioral reactivity to stress. (C) 1999 Elsevier Science Inc. All rights reserved.