Effects of differential rearing condition on heart rate conditioning and response suppression

Rats were reared in either an enriched or isolated environment for 60 days following weaning. Neither rearing environment nor sex affected heart rate conditioning. However, when the CS used during conditioning was subsequently presented in a drinking situation, males reared in isolation showed a greater degree of response suppression than did similarly reared females. Males and females reared in the enriched environment did not differ in degree of response suppression.