Brain Uses Quantum Effects, New Study Finds [video]
Scope of the “quantum brain” claim
- Several comments stress that the interesting claim is not “the brain uses quantum mechanics” (trivially true for all chemistry) but that neural systems may use light-based internal signaling and microtubules as photonic/quantum structures for ultrafast information processing.
- One reader notes the paper is mostly theoretical/simulation-based, with very limited experimental data (a few bulk fluorescence measurements) that might have simpler explanations.
Skepticism and “woo” concerns
- Multiple commenters expect this to trigger a wave of speculative consciousness/“quantum soul” narratives and are wary.
- Biophysics-minded participants argue that maintaining long-range coherence/entanglement in warm, wet tissue is extremely hard; biology would need to solve problems quantum engineers struggle with in cryogenic vacuum.
- Others note that neural computation already has well-established, classical mechanisms; any extra quantum layer would need strong evidence.
Quantum biology more broadly
- It is widely acknowledged that all biology rests on quantum chemistry.
- Specific putative or accepted cases are mentioned: photosynthesis, enzyme catalysis, tunneling/coherence in biomolecules, possible roles in olfaction, and ultra-weak photon emission from neurons.
- Some argue it would be surprising if evolution didn’t exploit useful quantum effects wherever possible.
Free will, determinism, and quantum randomness
- A large subthread debates whether quantum randomness can underwrite free will.
- One side: randomness vs determinism exhaust the options; adding quantum noise does not produce the kind of agency people care about.
- Others propose that if agents can in some way influence quantum outcomes, that might ground an intuitive notion of free will.
- Compatibilist views (free will as acting from one’s motives under causal laws) are contrasted with incompatibilist and “illusionist” positions; linked philosophy resources are discussed.
Quantum mechanics, computability, and consciousness
- Penrose-style arguments appear: human mathematical insight or consciousness might be non-computable in the Turing sense, possibly tied to quantum state reduction.
- Counterpoints: if a process is physically realizable, many argue it should in principle be computable by some (perhaps non-Turing) machine; brain dynamics are finite-state and do not literally solve the halting problem.
- Several commenters doubt that tying consciousness to quantum effects yields testable predictions or explanatory payoff at present.
Meta-reactions
- Some applaud the boldness and potential of the research direction; others see it as overinterpreted or premature.
- A recurring theme: enthusiasm for quantum biology as a field, coupled with insistence on clear experimental evidence before revising mainstream views of cognition or consciousness.