Scope of Investigation
Orch-OR (Orchestrated Objective Reduction) is a detailed theory developed by physicist Roger Penrose and anesthesiologist Stuart Hameroff.
It proposes that consciousness occurs when quantum coherence in neuronal microtubules undergoes a self-collapse associated with quantum gravity.
01
The Non-Computability of Mind
Penrose argued (using Gödel's Incompleteness Theorems) that human mathematical understanding is non-computable.
Therefore, consciousness cannot be a classical algorithm, requiring a physical process that goes beyond classical computation.
02
Microtubules as Quantum Processors
Hameroff proposed that microtubules—structural proteins within neurons—are shielded from environmental decoherence.
This allows them to sustain quantum superposition, which is then 'orchestrated' by synaptic inputs to collapse at conscious moments.
03
Microtubules and Warm, Wet Environments
Physicist Max Tegmark criticized Orch-OR, calculating that the brain is too warm, wet, and noisy to sustain quantum coherence for longer than a fraction of a picosecond.
Hameroff responds that structural water channels inside microtubules act as shields, protecting quantum states.