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.
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Wieland et al. (1963) studied this question.