title: Two methods for obtaining electrocardiograms of chair-restrained monkeys.
mesh_terms: D000818:Animals; D003214:Conditioning, Classical; D003216:Conditioning, Operant; D003213:Conditioning, Psychological; D004562:Electrocardiography; D004566:Electrodes; D000882:Haplorhini; D006339:Heart Rate; D008722:Methods; D011589:Psychology, Experimental / Q000295:instrumentation