[Latent contextual inhibition of the cardiac component in the startle reaction to a sound stimulus in XXXX ].

@entity35 @entity591 @entity1168
Heart rate (HR), freezing score, and motor component were estimated during acoustic startle (ASR) habituation (two sessions with 24-hour interval, 10 trials in a session). It was shown that @entity35 previously exposed to the experimental context (once for 5 min 24 h before training) demonstrated HR decrease in response to the first stimulus and @entity591 in response to the 4th-10th stimuli during the first session. The interstimulus HR declined from the 4th to the 6th trials. The same profile of cardiovascular response was observed in this group at the beginning of the second session with the following (to the 7th trial) habituation of @entity591 . These @entity35 didn't demonstrate the intertrial HR decrease during the second session. Nonadapted @entity35 responded by @entity1168 to the 1st and 2nd trials of the first session. The response didn't change for @entity591 with continuation of stimuli presentation. @entity591 appeared only in response to the 7th-10th trials of the second session and didn't habituate. The intertrial HR level decreased in this group only during the second session. The results are discussed in terms of contextual latent inhibition of the cardiac acoustic startle response.
