title: Tail pinch versus brain stimulation: problems of comparison.
mesh_terms: D000818:Animals; D001143:Arousal / Q000502:physiology; D001522:Behavior, Animal / Q000502:physiology*; D001921:Brain / Q000502:physiology; D004558:Electric Stimulation; D007858:Learning / Q000502:physiology; D010146:Pain / Q000503:physiopathology; D051381:Rats; D013623:Tail / Q000294:innervation