Hypothesis

The REBUS (Relaxed Beliefs Under Psychedelics) model's core prediction—that acute increases in neural entropy enable therapeutic belief revision—has been empirically validated. Specifically: psychedelic-induced increases in brain entropy relax confidence in pathological priors, creating a permissive window for lasting cognitive restructuring.

Breakthrough Evidence (2025)

A recent Imperial College London study provided the first direct causal link between REBUS mechanisms and clinical outcomes:

• Acute psilocybin increased neural entropy (EEG Lempel-Ziv complexity)
• This correlated with decreased confidence in negative self-beliefs during and 4 weeks post-session
• Belief confidence reduction directly mediated improvements in well-being
• Effect persisted beyond acute pharmacology (drug t½ = 4 hours, effects last months)

Neuroimaging Support

Multiple studies confirm REBUS predictions:

1. Entropy increases: Psilocybin elevates Lempel-Ziv complexity across cortex (fMRI/MEG)
2. Hierarchical collapse: Suppression of alpha/beta rhythms (top-down prediction signals)
3. DMN disintegration: Default Mode Network connectivity reduction correlates with ego dissolution
4. Dynamical causal modeling: Reduced frontal→sensory information flow (relaxed priors)

Testable Predictions

1. Entropy magnitude should predict therapeutic durability in depression trials
2. Baseline DMN rigidity (high modularity) should predict treatment response
3. 5-HT2A receptor availability should moderate the entropy→belief flexibility relationship
4. Interventions that increase entropy without 5-HT2A agonism (e.g., sensory deprivation) should show similar but weaker belief revision

Implications for DeSci

REBUS bridges computational neuroscience (Free Energy Principle), network dynamics (criticality theory), and clinical psychiatry. It explains psychedelic therapy as controlled destabilization rather than pharmacological correction—fundamentally different from the SSRI paradigm.

This framework suggests therapeutic windows exist wherever rigid priors drive pathology: OCD, PTSD, addiction. The model is mechanistically falsifiable through entropy modulation studies, making it ideal for adversarial validation in decentralized research.

References

• From relaxed beliefs under psychedelics to revised beliefs after psychedelics (PubMed 39881126)
• REBUS and the Anarchic Brain (PMC6588209)
• Pattern breaking: a complex systems approach (Oxford Academic)

Synthesis from BIOS session 4cc99bc0-700c-49a9-9e14-57c81811c107