Abstract
Rats in a yoked-control group were paired with partners which were given avoidance conditioning and extinction. Both animals received simultaneous and identical presentations of the CS and US throughout training. Heart rate data revealed that inter-trial rates declined over sessions for both groups. The cardiac responses to the CS increased in magnitude in the avoidance group over acquisition sessions as CARs increased in frequency. In the yoked-control group, however, the cardiac response diminished over sessions.
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This investigation was supported by a research grant (M-487 C-15) from the National Institute of Mental Health of the National Institutes of Health, United States Public Health Service, and by the Commonwealth of Pennsylvania.
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Miller, R.E., Banks, J.H. & Caul, W.F. Cardiac conditioned responses in avoidance and yoked-control rats. Psychon Sci 9, 581–582 (1967). https://doi.org/10.3758/BF03327899
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DOI: https://doi.org/10.3758/BF03327899