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Rats learned to voluntarily control heart rate (HR) using biofeedback, achieving significant HR reduction and lasting benefits like reduced anxiety. This bradycardia involved a specific neural pathway from the anterior cingulate cortex to the heart.

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Area of Science:

  • Neuroscience
  • Behavioral Biology
  • Physiology

Background:

  • Voluntary heart rate (HR) regulation is possible with real-time feedback.
  • Understanding the neural mechanisms of HR control is crucial for therapeutic interventions.

Purpose of the Study:

  • To investigate the neural circuitry underlying voluntary heart rate reduction using biofeedback in a rat model.
  • To determine the long-term effects of HR biofeedback training on behavior and physiology.

Main Methods:

  • Rats received real-time HR feedback via neocortex stimulation and medial forebrain bundle stimulation for reward.
  • Neural pathway manipulation involved inactivating anterior cingulate cortical (ACC) neurons projecting to the ventromedial thalamic nucleus (VMT) and theta-rhythm stimulation of this pathway.
  • Physiological and behavioral assessments included HR monitoring, anxiolytic behavior tests, and blood erythrocyte counts.

Main Results:

  • Rats achieved approximately 50% HR reduction within 5 days of biofeedback training.
  • The bradycardia persisted for at least 10 days post-training and was associated with anxiolytic behavior and increased erythrocyte count.
  • Inactivating the ACC-to-VMT pathway prevented bradycardia, while theta-rhythm stimulation replicated it, highlighting this pathway's critical role.

Conclusions:

  • The ACC-to-VMT neural pathway is essential for mediating voluntary heart rate reduction through biofeedback.
  • This pathway influences heart rate via projections to the dorsomedial hypothalamus and subsequently the nucleus ambiguus, controlling parasympathetic output.
  • HR biofeedback training induces lasting physiological and behavioral changes, suggesting potential therapeutic applications for conditions involving autonomic dysregulation.