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Reliability and validity of brain-gastric phase synchronization.

Gidon Levakov1, Shira Ganor1, Galia Avidan2

  • 1Department of Cognitive and Brain Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel.

Human Brain Mapping
|August 2, 2023
PubMed
Summary

Brain and stomach signals synchronize, but this connection is less reliable than previously thought, especially with motion artifacts. This study offers new methods for studying brain-stomach interactions.

Keywords:
electrogastrographyfMRIinteroceptionresting-statestomach

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Area of Science:

  • Neuroscience
  • Gastroenterology
  • Physiology

Background:

  • Recent research indicates brain regions synchronize with the stomach's electrical rhythm.
  • These gastric-brain interactions are crucial for feeding behavior and gastrointestinal disorders.
  • Reliability and robustness of these interactions, especially against artifacts, remain understudied.

Purpose of the Study:

  • To assess the reliability and robustness of gastric-brain interactions.
  • To investigate the impact of artifacts like motion on these synchronies.
  • To generalize findings on gastric-brain coupling to new samples.

Main Methods:

  • Concurrent electrogastrography (EGG), brain fMRI, and pulse oximetry were used in 43 subjects.
  • Analyses were repeated on an independent dataset for validation.
  • Statistical methods controlled for non-grey matter signals, head motion, and cardiac artifacts.

Main Results:

  • A network of brain regions coupled with EGG signals was identified after controlling for confounds.
  • The spatial extent of the gastric network was overestimated before confound regression.
  • Test-retest reliability was high for individual brain and gastric signals, but not for gastric-brain synchrony.

Conclusions:

  • Gastric-brain synchrony is less robust to artifacts than previously assumed.
  • Methodological improvements are needed for reliable investigation of brain-stomach interactions.
  • Findings provide a foundation for understanding the gastric network's role in health and disease.