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Male neonates of Wistar strain rats were given 0.63-2.50 g/kg/day of ethanol, i.p., for 7 successive days from day 6 to 12 after birth. The acquisition processes of the discriminated lever-press avoidance response (intertrial interval: 25 sec, warning stimuli presentation: 5 sec, foot shock intensity: 110V, 0.5 mA, 50 Hz, AC) were investigated for 20 separate sessions from day 60 after birth. The preference test for ethanol was done beginning at 120 days of age. No significant differences in body weights were detected between saline- and ethanol-pretreated groups. However, learning retardation was observed in all groups pretreated with ethanol. In these groups, slow responses to warning stimuli followed by escape responses from shocks delivered were often observed in early training sessions. An enhanced preference for ethanol was observed in all groups pretreated with ethanol for 7 successive days at maturity. These results suggest the possibility that learning ability and preference for ethanol in adult rats are strongly influenced by pretreatments with ethanol during the early postnatal period.

Learning Retardation and Enhanced Ethanol Preference Produced by Postnatal Pretreatments with Ethanol in Adult Rats