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Eight pregnant female rats were chronically treated via an osmotic pump with arginine vasopressin or placebo during days 13 to 19 gestation. All offspring were tested as adults in either a discrimination task or a 25 day retention of a passive avoidance response. The results revealed that rats whose mother had been treated with vasopressin did not differ from controls on the acquisition or reversal of a brightness discrimination; however, they did require more trials to reach criterion during the ten day memory test of discrimination reversal. Further, treatment resulted in impaired memory retrieval in male rats on the 25 day memory test, while female rats were not affected. Treatment did not influence body weight. The results indicated that vasopressin administered during the prenatal period of development may have had a teratogenic effect on memory retrieval.
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