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Pups were odor-0.5mA shock conditioned at either PN15 or PN16 with either a saline injection or one of two methods to reduce pups’ shock-induced CORT release (maternal presence, Metyrapone (50 mg/kg, i.p.) injection). Pups were then tested in a Y-maze the next day. Although both PN15 and PN16 pups are capable of learning odor aversion, only PN15 pups are capable of learning odor preference with attenuated CORT
