Discriminative heart rate conditioning with sustained inspiration as respiratory control.

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Abstract
In a classical discrimination paradigm with instructions to expect shock at certain temporal loci used to obtain anticipatory heart rate CRs [conditioned response], Ss [subjects], expected shock on a specific flash in 5 red sequences (CS [conditional stimulus] + trials), but not in 5 white sequences (CS-). 2 groups were compared with their preconditioning controls with the same respiration. The Normal Respiration group showed acceleration-deceleration on CS+, but no reliable form on CS-. The Sustained Inspiration group showed strong acceleration on CS+ and weak acceleration on CS-. Respiratory mediation of deceleration, often observed in HR conditioning, is strongly suggested. Stimulus substitution theory is lent support given accelerative CR and UR [unconditioned response].

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