“One of my theories is that one of the features of psychedelic experience, the specific feelings in the gut/groin that are often remarkable, and the »linkage of those feelings to the »meanings emergent in awareness from the radical transformations of the visual field, are probably the result of a transformation in the connection between the neuronal and perhaps bacterial features of the gut — and those of the brain, and, specifically, the visual system. It seems that an exotic (to common experience) form of »feedback ensues across this connection, where the visual or even imaginal experience feeds back into a specific aspect of its origin in the gut, further stimulating the cooperant gut neurons, which then feeds back into our visual ( and resulting/catalyzing emotional ) system. What seems to result is a sort of ‘standing wave’ in consciousness and somatic experience… which has a variety of wildly counterintuitive features and characteristics… and yet sustains itself for some time beyond whatever ‘peaks’ may occur…”

— infraheard