title: A new automatic constant current stimulator and its biological applications.
mesh_terms: D000818:Animals; D001331:Automation; D001921:Brain; D004056:Differential Threshold / Q000187:drug effects; D004558:Electric Stimulation / Q000295:instrumentation*; D004567:Electrodes, Implanted; D006632:Histamine / Q000494:pharmacology; D010812:Physical Stimulation; D051381:Rats; D012653:Self Stimulation; D013997:Time Factors
chemical_list: D006632:Histamine