Stuart Hameroff
Center for Consciousness Studies, University of Arizona
Quantum Consciousness depends on physics classical computers do not reproduce
Stuart Hameroff MD is an anesthesiologist, professor at the University of Arizona, and Director of the Center for Consciousness Studies. He is the co-founder and organizer of the biennial “Toward a Science of Consciousness” (The Science of Consciousness) conference series.
Drawing from his expertise in general anesthetics and their selective disruption of conscious awareness, Hameroff hypothesized that consciousness is mediated by quantum optical and vibrational resonances within cytoskeletal microtubules inside neurons. In the 1990s, he collaborated with mathematical physicist Roger Penrose to formulate the Orchestrated Objective Reduction (Orch-OR) theory, uniting quantum gravity with molecular neurobiology.
Hameroff’s work challenges the conventional synaptic doctrine of neuroscience, proposing that the fundamental unit of computation and conscious experience in the brain operates at the terahertz and gigahertz scale of cytoskeletal lattices, far below the speed of classical action potentials.
Known for. Orchestrated Objective Reduction (Orch-OR) with Roger Penrose, microtubule quantum resonance, anesthetic mechanisms of consciousness
Coverage on this site
Research Papers and Preprints
- Michael Wiest and the New Quantum Evidence for Orch-OR September 2026
- Stuart Hameroff and Roger Penrose on Orchestrated Objective Reduction August 2026
Keynotes and Event Talks
Related researchers
- Michael C. WiestDepartment of Neuroscience, Wellesley CollegeThe quantum microtubule substrate of consciousness and the anaesthetic-evidence thread for Orch-OR
- Sir Roger PenroseMathematical Institute, University of OxfordNobel Prize in Physics (2020), Orchestrated Objective Reduction (Orch-OR) with Stuart Hameroff, The Emperor's New Mind (1989), Shadows of the Mind (1994)
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Michael LevinAllen Discovery Center, Tufts UniversityBioelectric signalling, the cognitive light cone, and diverse intelligence
- Terrence J. SejnowskiComputational Neurobiology Laboratory, Salk Institute / UC San DiegoCo-inventor of the Boltzmann Machine, The Computational Brain (1992), Independent Component Analysis (ICA), The Deep Learning Revolution (MIT Press, 2018)
- Alysson R. MuotriDepartment of Pediatrics and Cellular & Molecular Medicine, UC San DiegoHuman brain organoids ('mini-brains'), spontaneous complex neural oscillations, electrophysiological development in in-vitro neural networks
- Susan SchneiderCenter for the Future Mind, Florida Atlantic UniversityArtificial Consciousness Tests (ACT), Artificial You, AI and the Future of Your Mind (Princeton, 2019), AI safety & cognitive rights, NASA-Baruch Blumberg Chair at Library of Congress
Stuart Hameroff is listed with the other quantum theorists, who hold that consciousness depends on physics classical computers do not reproduce. The theory family behind that position is set out in the index of consciousness theories. Every researcher covered on this site is indexed in the directory of consciousness researchers.