Evidence of a primary frustration effect following quality reduction in the double runway.
D000818:Animals; D003213:Conditioning, Psychological; D005106:Exploratory Behavior; D005247:Feeding Behavior; D005639:Frustration; D008297:Male; D009043:Motor Activity; D051381:Rats; D012055:Reinforcement Schedule; D012201:Reward; D013997:Time Factors