(A) When the body is at rest, Rebollo et al. found that the blood flow in the brain (as measured by functional magnetic resonance imaging; blue wave) and the electrical activity in the stomach (as measured by electrogastrography; red wave) are in delayed sync with each other (Rebollo et al., 2018). (B) Rebollo et al. discovered that the insula (green) was only marginally coupled with the stomach. We think that the activity of this region (green wave) will be more synchronous with that of the stomach when certain conditions are met (see main text).