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Nasal airflow promotes default mode network activity.

Morteza Salimi1, Fahime Ayene1, Tannaz Parsazadegan1

  • 1Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.

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Nasal airflow enhances brain oscillations in the default mode network (DMN), particularly in gamma frequencies, crucial for higher brain functions. This finding highlights the impact of nasal breathing on neural activity and brain connectivity.

Keywords:
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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Physiology

Background:

  • The default mode network (DMN) is central to resting-state consciousness and spontaneous brain activity.
  • Nasal breathing influences neural oscillations across widespread brain regions.
  • Understanding respiration's impact on DMN rhythms is vital for brain function research.

Purpose of the Study:

  • To investigate how respiration, specifically nasal airflow, entrains DMN rhythms.
  • To evaluate the effects of nasal breathing and nasal air-puff on DMN power and connectivity.

Main Methods:

  • Electroencephalography (EEG) was used to assess DMN activity in 16 healthy subjects.
  • Measurements included power spectral density and connectivity during resting states.
  • Three conditions were tested: nasal breathing, oral breathing, and nasal air-puff.

Main Results:

  • Nasal airflow, via breathing or air-puff, significantly enhanced DMN power and connectivity.
  • This enhancement was most prominent in higher frequency bands, especially gamma ranges.
  • Brain activity and connectivity in DMN and somatosensory areas were improved by nasal airflow, irrespective of attention.

Conclusions:

  • Nasal airflow promotes brain oscillations, particularly in the gamma frequency range.
  • Gamma oscillations are essential for advanced cognitive functions.
  • This study underscores the significant role of nasal airflow in modulating neural activity.