The entropic brain: a theory of conscious states informed by neuroimaging research with psychedelic drugs.
Level 5 - mechanism / opinion, no new human data
Theoretical framework synthesizing prior neuroimaging observations without presenting new empirical data.
PubMed 24550805 · doi:10.3389/fnhum.2014.00020
What was done
This paper presents a theoretical framework synthesizing prior neuroimaging data (principally with psilocybin) to conceptualize conscious states through the lens of thermodynamic and informational entropy. The author defines "primary states" (such as psychedelic states, REM sleep, and early psychosis) and contrasts their brain dynamics and cognitive characteristics with normal waking consciousness and anesthesia.
What was found
The abstract reports no empirical numbers or statistical tests. Conceptually, it posits that primary states feature an expanded repertoire of functional connectivity motifs over time (elevated entropy) operating near criticality, whereas normal waking consciousness suppresses entropy to support reality-testing and metacognition. It also hypothesizes that entering primary states involves the collapse of organized default-mode network (DMN) activity and decoupling between the DMN and the medial temporal lobes.
Why it matters
It establishes the influential "entropic brain" hypothesis, providing a unifying conceptual bridge between psychedelic neuropharmacology, statistical physics concepts (entropy and criticality), and cognitive phenomenology.
Limits
As a purely theoretical paper, it reports no new empirical data, sample size, or prospective measurements. The core mechanistic proposals rely on qualitative interpretations of existing psilocybin functional imaging literature and remain hypotheses requiring systematic empirical testing across diverse conscious states.
Cited by
- context Brain imaging of the default mode network shows schizophrenia and significant dissociative disorders have a loose electrical patterning compared to obsessive ruminative states.