Pavlovian Inhibition of Delay in Cardiac and Somatic Responses in Dogs: Schizokinesis

Abstract

A group of dogs were given a 42-sec. tone followed by shock and the emergence of conditional inhibition of delay in both the cardiac and flexion response systems monitored. All dogs manifested conditional flexion inhibition of delay while the cardiac conditional response varied. In some dogs, maximum heart-rate conditional acceleration occurred concomitantly with the flexion response, while in other dogs maximum cardiac conditional acceleration occurred during the first 20 sec. of the conditional signal for over 300 trials. These patterns were maintained during subsequent discriminative conditioning. These data were discussed in light of the theory of schizokinesis in classical conditioning.