Research gap at a glance
- Question: Does an individual’s strength of gastric-brain coupling predict their gastric percepts, feelings, spontaneous body-directed thought or questionnaire reports, and do those reports change when coupling is manipulated?
- Why it matters: The gastric network is the best causally supported brain-body coupling in the wiki, but without a link to experience it may be a rhythm that entrains sensorimotor cortex for reasons unrelated to visceral perception. A link would make it an interoceptive network in the full sense; its absence would move it out of interoception.
- Theme: Mechanism
- Status: open
What the wiki already knows
- After strict confound control the network covers about 1.16% of grey matter in occipital cortex, precuneus, bilateral insula, somatomotor cortex and cerebellum, sitting in unimodal rather than transmodal cortex (Gastric network, Levakov et al. (2023)).
- Coupling is reduced by vagotomy in rats and increased by auricular vagal stimulation in humans, so it is plausibly driven by ascending vagal traffic (Gastric network, Bioelectronic medicine).
- No study has connected an individual’s coupling strength to a percept, a feeling or a questionnaire (Gastric network).
- Attending to the stomach engages occipitotemporal territory that overlaps the coupling map, but the overlap was judged from a figure and visual imagery was not excluded (Haruki & Ogawa (2023)).
- In resting thought, stomach content topped the body-wandering loadings and body-wandering has a thalamo-somatomotor signature; whether this is the same phenomenon as the gastric network is untested and described as cheap to test (Body-wandering, Banellis et al. (2026)).
What would answer it
- Once a reliable individual coupling estimate exists, record Electrogastrography (EGG) and fMRI with thought probes and gastric sensation ratings in the same scan, relate each person’s coupling to stomach-directed body-wandering and to gastric percepts, and test whether fasting versus feeding or vagal stimulation shifts coupling and reports together.
Connections
- Raised on: Gastric network, Body-wandering, Haruki & Ogawa (2023), Engelen et al. (2023)
- Related concepts: Gastric network, Body-wandering, Insular cortex, Precuneus, Cardiac cycle effects
- Related debates: Can brain–body coupling be measured in a person?, inferential?
The Gastric network page puts its first open question plainly: nobody has shown that anyone feels anything as a function of their gastric-brain coupling. The network’s location adds to the puzzle. If coupling served the interpretation of bodily state one would expect anterior insula or default-mode territory, but the surviving map sits where the brain does sensing and moving, and Engelen et al. (2023) go so far as to propose that the gastric rhythm coordinates sensorimotor cortex by bypassing higher-level regions, a hypothesis they describe as untested.
Two recent findings narrow the gap without closing it. Haruki and Ogawa (2023) reached overlapping visual cortex by an instruction to attend to the stomach, and Banellis et al. (2026) found the stomach at the top of what resting minds drift towards, with a neural signature in the same unimodal territory. Both are facts about maps or groups rather than about whether a given person’s coupling tracks what that person experiences.
The person-level test depends on Is gastric-brain coupling unreliable because recordings are short, or because it is a state?: if coupling has no stable individual value, correlations with individual reports cannot be interpreted. A within-person manipulation design avoids part of that problem, because it asks whether coupling and reports move together when hunger or vagal input changes.