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Classical conditioning of heart rate and blood pressure inMacaca mulatta

Elsevier B.V.
Publication Date
DOI: 10.1016/0165-1838(80)90041-7
  • Heart Rate
  • Blood Pressure
  • Classical Conditioning
  • Rhesus
  • Cardiovascular System


Abstract Classical delay conditioning of heart rate, and of systolic and diastolic blood pressures, was carried out in 16 rhesus monkeys. Blood pressure and inter-systolic interval were measured from an in-dwelling arterial catheter; recordings were taken prior to conditioned stimulus (CS) on each trial, during a 20 sec visual stimulus that filled the conditioned-unconditioned stimulus (CS-UCS) interval, and following UCS (a brief electric tail-shock). The heart rate response both to CS and to UCS was biphasic (acceleration followed by deceleration); the blood pressure response functions were more complex, and were different for the CS and post-UCS periods. Comparison of the patterns of cardiac and blood pressure responses on any trial indicates a possible sequence of baroreceptor reflex activity.

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