Abstract
A comparison was made of heart-rate (HR) responses of restrained rats to CSs that were part of an explicitly unpaired or a truly random control procedure. Subsequent to these procedures, an assessment was made of the relative capacities of these CSs to affect an established HR CR in a combined-cue paradigm and to impede the development of a HR CR in a reversal-conditioning situation. The principal findings were (1) that the explicitly unpaired and truly random CSs generated HR responses of opposite direction, i.e., HR acceleration vs. HR deceleration, respectively, and (2) that conditioning of a decelerative HR CR to the CS that had earlier been employed in the explicitly unpaired procedure was retarded compared to what was obtained to the truly random CS. The two CSs did not have reliably different effects in the combined-cue test. It was suggested that the truly random CS may have produced both associative and nonassociative influences on HR. It was hypothesized further than the explicitly unpaired CS may have acquired the capacity to function as a conditioned inhibiting stimulus.
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This research was supported by National Science Foundation Grant BMS74-18542, by an Oregon Heart Association grant, and in part by a U.S. Public Health Service grant, 5 SOI RR05412.
David L. Francisco was a predoctoral trainee on a National Institute on Alcohol Abuse and Alcoholism grant (5 T01-AA00033-03).
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Cunningham, C.L., Fitzgerald, R.D. & Francisco, D.L. Excitatory and inhibitory consequences of explicitly unpaired and truly random conditioning procedures on heart rate in rats. Animal Learning & Behavior 5, 135–142 (1977). https://doi.org/10.3758/BF03214068
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DOI: https://doi.org/10.3758/BF03214068