INSTRUMENTALLY CONDITIONED HEART RATE AFFECTED BY ATROPINE SULFATE, ATROPINE METHYLNITRATE, PROPRANOLOL AND PHENTOLAMINE IN THE CURARIZED RAT

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The heart rate of the curarized rat gradually increased and decreased over a period of avoidance training depending upon the direction to which the heart rate change to CS was reinforced. When shaping was made for increases of heart rate, the conditioned heart rate increase to CS was abolished under propranolol, while it was clearly observed under two types of atropines. The reverse pattern was shown for shaping of decreases. The conditioned heart rate change was not depressed under phentolamine or saline. These results indicate that shaping the heart rate for increases and for decreases is indeed possible through the formation of avoidance conditioning of the heart rate change to CS, and the heart rate increase and decrease to CS are differentially mediated through increased tones of the sympathetic and parasympathetic systems innervating cardiac muscle, respectively.
公益社団法人日本心理学会の論文