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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Respiratory Physiology

Background:

  • Emerging research indicates a link between brain activity synchronized with respiration and cognitive function.
  • Prior human studies show inconsistent findings regarding task performance during different respiratory phases.
  • The precise influence of specific respiratory phase transitions on cognitive processes remains unclear.

Purpose of the Study:

  • To investigate whether cognitive performance is modulated by the timing of breathing components during memory retrieval.
  • To determine the specific role of the expiratory-to-inspiratory (EI) phase transition in cognitive task performance.
  • To differentiate the effects of respiratory phase-locked versus non-phase-locked cognitive task presentation.

Main Methods:

  • Employed a delayed matching-to-sample visual recognition task with 18 healthy participants.
  • Utilized a respiratory phase-locked (Phased) and a regularly paced (Non-phased) presentation paradigm for task cues.
  • Measured response time (RT) and accuracy during specific respiratory phase transitions (EI and inspiratory-to-expiratory).

Main Results:

  • In the Phased session, the EI transition significantly increased RT by 466 ms (p=0.003) and decreased accuracy by 21.4% (p=0.004).
  • These breathing-dependent performance decrements were most pronounced when the EI transition occurred mid-retrieval.
  • No significant changes in RT or accuracy were observed during the inspiratory-to-expiratory phase transition or in the Non-phased condition.

Conclusions:

  • This study provides the first evidence that a specific respiratory phase transition (EI) modulates cognitive task performance.
  • Breathing-dependent cognitive fluctuations occur on a timescale of seconds, particularly around the EI transition.
  • Mitigating these breathing-induced cognitive variations may be essential for maintaining stable performance in daily activities and sports.