Sinoaortic denervation does not prevent differential Pavlovian conditioning of bradycardia in rabbits

Theodore W. Jarrell, Christopher G. Gentile, Philip M. McCabe, Neil Schneiderman

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Recent findings suggest that descending projections from the amygdaloid central nucleus of the solitary tract (NTS) may modulate the baroreceptor reflex and thereby facilitate the expression of the bradycardiac conditioned response (CR) in rabbits18,21. The purpose of the present study was to examine the role of the afferent limb of the baroreceptor reflex in differential Pavlovian conditioning of bradycardia in rabbits. Animals received either aortic denervation, sinoaortic denervation or sham denervation. After recovery from surgery, animals received one differential Pavlovian conditioning session per day over the nex 6 days. Sinoaortic denervation abolished the baroreceptor reflex as assessed by intravenous injections of phenylephrine. In addition, sinoaortic denervation increased baseline heart rate (HR), altered the topography of the HR unconditioned response, but did not abolish the HR orienting response or prevent the acquisition of bradycardiac CRs. The findings of the present study suggest that afferent barosensory input is not necessary for the expression of the HR CR in rabbits. However, descending ACE projections may stil play a role in the HC CR by directly affecting NTS neurons.

Original languageEnglish (US)
Pages (from-to)251-258
Number of pages8
JournalBrain research
Issue number2
StatePublished - Sep 3 1986


  • baroreceptor reflex
  • bradycardia
  • differential pavlovian conditioning
  • rabbit
  • sinoaortic denervation

ASJC Scopus subject areas

  • Developmental Biology
  • Molecular Biology
  • Clinical Neurology
  • Neuroscience(all)


Dive into the research topics of 'Sinoaortic denervation does not prevent differential Pavlovian conditioning of bradycardia in rabbits'. Together they form a unique fingerprint.

Cite this