Endorphins and extinction: differential actions on appetitive and adversive tasks.
D000818:Animals; D001070:Appetitive Behavior / Q000187:drug effects*; D001362:Avoidance Learning / Q000187:drug effects*; D004327:Drinking Behavior / Q000187:drug effects; D004723:Endorphins / Q000494:pharmacology*; D005108:Extinction, Psychological / Q000187:drug effects*; D008297:Male; D051381:Rats; D013997:Time Factors
D004723:Endorphins