Then (1954), The Doors of Perception
The Reducing Valve: Was Huxley Right?
The brain acts as a "reducing valve," filtering out most of what consciousness could perceive to prevent sensory overwhelm. Mescaline disables this filter, allowing access to "Mind at Large", not creating hallucinations but removing suppression of what was already there.
Confirmed by Science
The default mode network model in contemporary neuroscience is structurally similar: the DMN maintains predictive models that suppress perceptual inputs not confirming expectations. Psychedelics reduce DMN connectivity (documented across multiple fMRI studies). The predictive coding framework formalizes what Huxley described intuitively. The asymmetry Huxley failed to account for, that opened perception is sometimes terrifying, not just beautiful, remains without a complete explanation in either model.
Sources
- Huxley, The Doors of Perception (1954)
- Nichols, Pharmacological Reviews (2016)
- Carhart-Harris et al., various [Source not found; under review]