Abstract
An auditory startle stimulus was presented 1, 17, and 27 sec following termination of a second-order, classically conditioned, fear-evoking CS. Forward second-order conditioned Ss consistently exceeded the startle magnitudes of backward second-order conditioned controls at all intervals. An analysis of movement during the CS2-startle intervals indicated that a postural interpretation could not account for startle augmentation in experimental Ss. A drive-like construct was posited to handle these data.
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