Conditioned blood and heart rate in monkeys.

Abstract

Molded plastic flow sections were implanted on the terminal aorta of 6 monkeys and the connecting wires brought through the back to an ultrasonic flowmeter. The Ss [subjects] were thentrained ina classical delayed conditioned response paradigm. 2 stimulus lights of different colors were randomly presented to the animal for a 56-sec. period; 1 light was followed by nothing, the other by a brief electrical shock. Conditioned increases in heart rate and blood flow were demonstrated. Discrimination was shown in 5 of the Ss. Records of body movement and respiration indicated that these factors have a negligible influence on the CR [conditioned response].