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The brain functions primarily as a reducing valve, filtering most of what could be perceived
Education, not medical advice. Drafts and study material from an independent research library. Citations on this page were checked on Oct 13, 2026; claims in the body text and organizational sources are still under review. What was checked.
The brain functions primarily as a reducing valve, filtering most of what could be perceived
Partially Confirmed recorded as “Supported as a Model, Not Proven” The Doors of Perception
The REBUS model (Carhart-Harris & Friston, 2019) formalizes this as 'precision weighting of top-down priors.' Early fMRI work found reduced default mode network activity under psilocybin (Carhart-Harris et al., PNAS, 2012), though later studies have reported mixed patterns. Huxley's 1954 metaphor fits predictive coding models well; the models themselves are still being tested.
Huxley, The Doors of Perception (1954) / Carhart-Harris & Friston (2019)
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- Huxley's Reducing Valve: The Verdict Is In, the editorial draft this item belongs with
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Course modules that use this claim
- The Science of the Experience Course module
Drafts on the same book
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- Cary Grant in the Psychiatrist's Chair Editorial draft
- What We Teach Children Not to See Editorial draft
- The Perennial Philosopher on Drugs Editorial draft
- From Reducing Valve to REBUS: Huxley's Neuroscience, Seventy Years On Editorial draft
- The Mystical Experience as Medicine: What the Trials Are Measuring Editorial draft
- From Mescaline to Schedule I: The Legal Journey of Huxley's Plant Editorial draft
- Huxley's Vision, Oregon's Program: Regulated Access in Practice Editorial draft
- The Religious Freedom Argument: Sacred vs. Recreational Editorial draft
- Who Gets Access: The Equity Problem in Psychedelic Medicine Editorial draft
- Why Huxley Reached for Vermeer Editorial draft
- Soma vs. Mescaline: The Two Huxleys Editorial draft
- The Gratuitous Grace: On Not Needing It Editorial draft
- Words and Things: Huxley's Epistemological Complaint Editorial draft
- Eight Hours That Changed Everything Editorial draft
- Huxley's Reducing Valve: The Verdict Is In Editorial draft
- The Man in the Garden Chair Editorial draft
Reading list for this book
- Reading list: The Doors of Perception Reading list
NotebookLM packs on this book
- The Reducing Valve NotebookLM source pack
Bridge pieces that use this book
Science annotations on this book
- The brain's primary function is to restrict consciousness rather than produce it, filtering out most of what... Science annotation
Then vs. Now comparisons on this book
- The Reducing Valve: Was Huxley Right? Then vs. Now comparison
- Art as 'Ersatz Suchness': Huxley's Claim Then vs. Now comparison
- Mescaline and Schizophrenia: The Psychotomimetic Theory Then vs. Now comparison
- Psychedelic Education Reform: Huxley's Proposal Then vs. Now comparison
- The Gratuitous Grace: Huxley's Theology Then vs. Now comparison
- The Default Mode Network: Huxley's Reducing Valve Gets a Name Then vs. Now comparison
- Mystical Experience as Therapeutic Mechanism: Huxley's Intuition Becomes Clinical Protocol Then vs. Now comparison
- Psilocybin for End-of-Life Anxiety: Huxley's Island Made Clinical Then vs. Now comparison
- Drug-Induced Mystical Experience vs. 'Spontaneous' Mystical Experience: Is There a Difference? Then vs. Now comparison
- Huxley's Critique of Western Education: The Case for Consciousness Literacy Then vs. Now comparison
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- The First Contacts Course module