Abstract
Effect of response interference on diminution of electrodermal unconditioned response. The purpose of this experiment was to study whether the phenomenon called —conditioned diminution of the unconditioned response (UR)— is produced by the physiological mechanism of response interference, or fusion, between the conditioned response (CR) and the UR, as suggested by the response interference and inhibition of delay hypotheses. Sixty volunteer subjects received discrimination training in which a CS was reinforced (CS+/US) and a second CS was not reinforced (CS-). The interval between the CS and unconditioned stimulus (US; aversive white-noise) was 8 seconds. Only the results of subjects exhibiting discriminative control were analyzed. The results show that neither the amplitude, nor the latency of the preceding CR affect the amplitude of the UR. Because these results cannot be explained by the response interference or inhibition of delay hypotheses, an alternative explanation is offered, suggesting the presence of an associative basis of the phenomenon.
