Choice between rewarding brain stimuli of differing length.
D000222:Adaptation, Physiological; D000818:Animals; D002755:Choice Behavior; D003216:Conditioning, Operant; D003657:Decision Making; D004192:Discrimination, Psychological; D008297:Male; D008474:Medial Forebrain Bundle / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology*; D051381:Rats; D012201:Reward; D012653:Self Stimulation; D013045:Species Specificity; D013997:Time Factors