The Effects of Prenatal X-Irradiation on Acquisition, Retention, and Extinction of a Conditioned Emotional Response

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Abstract
Female albino rats irradiated on the sixteenth day of prenatal development were trained on an emotional conditioning procedure superimposed on a lever-pressing performance for water reward. Acquisition of the conditioned emotional response (CER) by the irradiated animals was demonstrated at shock intensities and durations consistently below those required to establish the CER in a comparable nonirradiated control group. At 60 days and again at 175 days after acquisition of the CER by all animals, retention tests showed no differences between the groups, although the nonirradiated control animals were more resistant to extinction of the CER than the irradiated rats.

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