title: Incentive contrast and deprivation factors in a discrete-trial bar-press situation.
mesh_terms: D000818:Animals; D003216:Conditioning, Operant; D005108:Extinction, Psychological; D005163:Factor Analysis, Statistical; D005260:Female; D005639:Frustration; D009042:Motivation; D051381:Rats; D012054:Reinforcement, Psychology