Perceptual reaction times are coupled to the gastric electrical rhythm
Loescher, M.; Wolpert, N.; Tallon-Baudry, C.
Show abstract
The gastric rhythm, a slow (0.05 Hz) electrical oscillation continuously generated by the stomach, phase-synchronises neural activity across all sensory and motor cortices. Yet the functional relevance of this coupling remains unknown. We measured in humans the gastric rhythm with electrogastrography in three independent, distinct experiments (total N = 90): a speeded supra-threshold tactile detection task, a self-paced visual exploration task, and an unspeeded near-threshold visual detection task. Leveraging Spline Generalized Linear Modelling to flexibly uncover higher-order phase-amplitude coupling modes, we found perceptual reaction times (RTs) to be coupled to gastric phase across all experiments. Coupling to gastric phase was independent from effects of cardiac and respiratory rhythms rates and phases. By showing that the gastric rhythm contributes to the internal state shaping perceptual variability on a scale comparable to cardiac and respiratory rhythms, this work opens a new avenue for the understanding of the function of gastric-brain coupling.
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