Intensity of the Unconditional Stimulus as a Factor in Conditioning Out of Awareness

Abstract
The findings of the present report demonstrate that the intensity of shock used as the US is an important parameter in the establishment of a conditioned-heart-rate response in which the subject is unaware of the CS-US connection. It was also found that there is a difference in the conditioned and generalized responses of subjects who verbally reported awareness of the CS-US relationship as contrasted with those who were unaware.