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Respiration-Entrained Brain Rhythms Are Global but Often Overlooked
Adriano B L Tort1, Jurij Brankačk2, Andreas Draguhn3
1Brain Institute, Federal University of Rio Grande do Norte, Natal, RN 59056-450, Brazil; These authors contributed equally to this work.
Trends in Neurosciences
|February 13, 2018
Summary
Nasal breathing creates brain rhythms matching breath rate in rodents. This respiration-gamma coupling may influence brain communication, requiring simultaneous recording for accurate analysis.
Area of Science:
- Neuroscience
- Respiratory Physiology
- Brain Oscillations
Background:
- Recent evidence indicates nasal respiration entrains brain oscillations to breathing frequency in rodents.
- Respiration modulates gamma-band (70-120Hz) amplitude, particularly in frontal brain regions.
- Previous studies on delta/theta power and coupling might be confounded by respiration-entrained rhythms.
Purpose of the Study:
- To re-evaluate evidence on respiration-entrained brain oscillations.
- To highlight the potential for respiration to influence findings on brain synchrony and coupling.
- To propose simultaneous recording of respiration and electrophysiology for accurate brain oscillation identification.
Main Methods:
- Revisiting and analyzing existing electrophysiological and respiratory data from rodent studies.
- Comparing brain oscillation patterns with concurrent respiratory activity.
- Focusing on delta (1-4Hz), theta (4-8Hz), and gamma (70-120Hz) frequency bands.
Main Results:
- Nasal respiration synchronizes brain oscillations to breathing frequency across multiple rodent brain regions.
- A specific gamma sub-band (70-120Hz) amplitude is modulated by respiration, most notably frontally.
- Previous findings on delta/theta power, synchrony, and delta-gamma/theta-gamma coupling may reflect respiration effects.
Conclusions:
- Simultaneous tracking of respiration and brain activity is crucial for accurate interpretation of neural oscillations.
- Respiration-entrained oscillations are a significant factor in rodent brain activity.
- These respiration-entrained oscillations are hypothesized to facilitate long-range brain communication.
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