title: Intracranial reinforcement in pigeons: an analysis using concurrent schedules.
mesh_terms: D000818:Animals; D010856:Columbidae; D003216:Conditioning, Operant; D004558:Electric Stimulation; D004567:Electrodes, Implanted; D007031:Hypothalamus / Q000502:physiology*; D012055:Reinforcement Schedule; D012054:Reinforcement, Psychology; D012653:Self Stimulation; D013238:Stereotaxic Techniques