WENZEL, B M Changes in heart rate associated with responses based on positive and negative reinforcement. [electronic resource] - Journal of comparative and physiological psychology Dec 1961 - 638-44 p. digital Publication Type: Journal Article ISSN: 0021-9940 Standard No.: 10.1037/h0043530 doi Subjects--Topical Terms: Heart--physiologyHeart RateHumansLearningReinforcement, Psychology