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Slow-paced inspiration regularizes alpha phase dynamics in the human brain.

Shen-Mou Hsu1,2, Chih-Hsin Tseng3, Chao-Hsien Hsieh1,4

  • 1Imaging Center for Integrated Body, Mind and Culture Research, National Taiwan University, Taipei, Taiwan (R.O.C.).

Journal of Neurophysiology
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Summary

Slow breathing, particularly during inspiration, organizes alpha brain wave timing across widespread brain areas. This controlled respiratory pattern reveals a dynamic neural network integrated with volitional control.

Keywords:
MEGalphabreathingoscillationphase

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Area of Science:

  • Neuroscience
  • Respiratory Physiology
  • Cognitive Science

Background:

  • Low-frequency cortical activity organizes brain processes by providing temporal coding frames.
  • Cortical phase flexibility allows response to external influences, including respiratory inputs.
  • Controlled slow breathing is used for mental regulation, suggesting a link between respiration and cognition.

Purpose of the Study:

  • To investigate how slow breathing reorganizes the relationship between respiratory and cortical rhythmic systems.
  • To determine if cortical phase adjusts to slow respiratory inputs.
  • To explore the neural mechanisms underlying the integration of volitional breathing and brain activity.

Main Methods:

  • Simultaneous magnetoencephalography (MEG) and respiratory measurements were used.
  • Participants performed paced breathing at normal and slow rates.
  • Cortical phase activity in the alpha range was analyzed in relation to respiratory cycles.

Main Results:

  • Slow breathing modulated alpha cortical phase activity across widespread brain areas.
  • Modulation effects were locked to the middle of the inspiration phase and showed a structured pattern.
  • Individual participants exhibited consistent, diametrically opposed phase angles across breaths during slow breathing.

Conclusions:

  • Slow-paced inspiration can organize cortical phase activity into a regularized pattern.
  • This suggests a rhythmic, dynamic neural network integrated with neurophysiological systems via volitional control.
  • Volitionally controlled slow breathing systematically modulates cortical activity, highlighting its role in cognitive and emotional regulation.