Modification of operant performance in pigeons by increased pressures of nitrogen and helium.
D000222:Adaptation, Physiological; D000818:Animals; D010856:Columbidae; D003216:Conditioning, Operant / Q000187:drug effects*; D006371:Helium / Q000494:pharmacology; D009584:Nitrogen / Q000494:pharmacology; D011312:Pressure; D012055:Reinforcement Schedule
D006371:Helium; D009584:Nitrogen