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Scratching central pattern generators (CPGs) can reset respiratory rhythm. Tactile stimuli triggering fictive scratching in decerebrate cats caused significant respiratory phase resetting, involving brainstem interneurons.

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Area of Science:

  • Neuroscience
  • Respiratory Physiology
  • Locomotor Control

Background:

  • Respiratory rhythmicity can be phase reset by various stimuli, including swallowing.
  • Locomotion and respiration are intrinsically linked.
  • The interaction between scratching central pattern generators (CPGs) and respiration is poorly understood.

Purpose of the Study:

  • To investigate whether activating the scratching CPG can induce phase resetting of the respiratory rhythm.
  • To explore the neural mechanisms underlying the interaction between spinal and brainstem CPGs.

Main Methods:

  • Decerebrate cats were used as an animal model.
  • Brief tactile stimuli were applied to the pinna during the inspiratory-expiratory transition.
  • Fictive scratching and respiratory rhythm were monitored to assess phase resetting.

Main Results:

  • Stimuli that did not elicit fictive scratching did not reset the respiratory rhythm.
  • Tactile stimuli eliciting fictive scratching resulted in significant respiratory rhythm phase resetting.
  • Interneurons in the medulla oblongata showed phase resetting associated with scratching-CPG activity.

Conclusions:

  • Activation of the scratching CPG can indeed reset the respiratory rhythm.
  • The observed respiratory phase resetting involves brainstem components of the respiratory CPG.
  • This study provides new insights into the resetting of respiratory rhythm by a spinal CPG.