That's the wrong level of description. It adds little to the argument about whether neurochemistry or perception underly the efficacy of psychedelic treatments.

That's the wrong level of description. It adds little to the argument about whether neurochemistry or perception underly the efficacy of psychedelic treatments. As a counterpoint - human cognition and perception only exist in contexts beyond the brain - a perceived world, brain development through perceptual stimulation, language acquisition etc. Brain in a vat does nothing.