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A Free-breathing fMRI Method to Study Human Olfactory Function
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Inhalation boosts perceptual awareness and decision speed.

Ludovic Molle1,2, Alexandre Coste1, Charles-Etienne Benoit3

  • 1EuroMov Digital Health in Motion, Univ Montpellier, IMT Mines Ales, Montpellier, France.

Journal of Neurophysiology
|August 2, 2023
PubMed
Summary
This summary is machine-generated.

Breathing influences consciousness. Inhalation, compared to exhalation, enhances perceptual awareness and decision-making speed for near-threshold stimuli without affecting accuracy.

Keywords:
attentionconsciousnessdecision-makingrespiration

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Physiology

Background:

  • Consciousness and subjective experience remain poorly understood.
  • Attention is crucial for information processing and consciousness.
  • Breathing phase (inhalation/exhalation) may modulate attention and awareness.

Purpose of the Study:

  • To investigate if inhalation improves perceptual awareness and decision-making compared to exhalation.
  • To test the hypothesis that breathing phase impacts near-threshold perception.

Main Methods:

  • Recorded breathing rhythms in 30 human participants.
  • Participants performed a near-threshold decision-making task involving Gabor orientation.
  • Assessed both objective decision-making (orientation) and subjective awareness ratings.

Main Results:

  • Inhalation significantly improved perceptual awareness relative to exhalation.
  • Inhalation accelerated objective decision-making speed without compromising accuracy.
  • Breathing phase demonstrably influences cognitive processes.

Conclusions:

  • Breathing rhythm, specifically inhalation, enhances subjective awareness and decision-making.
  • Physiological rhythms like breathing play a role in shaping conscious experience.
  • Findings contribute to understanding the physiological underpinnings of consciousness.