title: The contact method: a simple technique for electrical self-stimulation without external leads.
mesh_terms: D000818:Animals; D000830:Animals, Laboratory; D003216:Conditioning, Operant; D004558:Electric Stimulation / Q000295:instrumentation*; D004567:Electrodes, Implanted; D007031:Hypothalamus / Q000502:physiology; D008297:Male; D008722:Methods; D051381:Rats; D012201:Reward; D012653:Self Stimulation