World Library  
Flag as Inappropriate
Email this Article

Quantum mind

Article Id: WHEBN0007850102
Reproduction Date:

Title: Quantum mind  
Author: World Heritage Encyclopedia
Language: English
Subject: Consciousness, Evan Harris Walker, Modern physics, Wholeness and the Implicate Order, Copyright problems/2006 October 28
Collection: Quantum Mind, Theories of Mind
Publisher: World Heritage Encyclopedia

Quantum mind

The quantum mind or quantum consciousness[1] hypothesis proposes that classical mechanics cannot explain consciousness. It posits that quantum mechanical phenomena, such as quantum entanglement and superposition, may play an important part in the brain's function and could form the basis of an explanation of consciousness. It is not a single theory, but a collection of hypotheses.

A few theoretical physicists have argued classical physics is intrinsically incapable of explaining the holistic aspects of consciousness, whereas quantum mechanics can. The idea that quantum theory has something to do with the workings of the mind go back to Eugene Wigner. He assumed the wave function collapses due to its interaction with consciousness. Physicist Freeman Dyson argued that "mind, as manifested by the capacity to make choices, is to some extent inherent in every electron."[2] However, most contemporary physicists and philosophers consider these arguments to be unconvincing.[3] Physicist Victor Stenger characterized quantum consciousness as a "myth" having "no scientific basis" that "should take its place along with gods, unicorns and dragons."[4]

The philosopher David Chalmers has argued against quantum consciousness. He has instead discussed how quantum mechanics may relate to dualistic consciousness.[5] Chalmers is skeptical of the ability of any new physics to resolve the hard problem of consciousness.[6][7]


  • Description of main quantum mind approaches 1
    • David Bohm 1.1
    • Roger Penrose and Stuart Hameroff 1.2
    • Umezawa, Vitiello, Freeman 1.3
    • Karl Pribram 1.4
    • Henry Stapp 1.5
  • Criticism 2
  • See also 3
  • References 4
  • Further reading 5
  • External links 6

Description of main quantum mind approaches

David Bohm

David Bohm viewed quantum theory and relativity as contradicting one another. The contradiction implied there existed a more fundamental level in the physical universe.[8] He claimed both quantum theory and relativity pointed towards this deeper theory, which he formulated in terms of a quantum field theory. This more fundamental level was proposed to represent an undivided wholeness and an implicate order, from which arises the explicate order of the universe as we experience it.

Bohm proposed implicate order applies both to matter and consciousness and suggested it could explain the relationship between them. Mind and matter are seen as projections into our explicate order from the underlying reality of the implicate order. Bohm claims that when we look at the matter in space, we can see nothing in these concepts that helps us to understand consciousness.

In trying to describe the nature of consciousness, Bohm discussed the experience of listening to music. He believed the feeling of movement and change that make up our experience of music derives from both the immediate past and the present both being held in the brain together. The notes from the past are seen as transformations rather than memories. The notes that were implicate in the immediate past are seen as becoming explicate in the present. Bohm viewed this as consciousness emerging from the implicate order.

Bohm saw the movement, change or flow, and the coherence of experiences, such as listening to music, as a manifestation of the implicate order. He claimed to derive evidence for this from the work of Jean Piaget[9] in studying infants. He stated these studies show that young children have to learn about time and space not because they are part of the explicate order; rather, they have a "hard-wired" understanding of movement because it is part of the implicate order. He compared this "hard-wiring" to Chomsky's theory that grammar is "hard-wired" into young human brains.

A major weakness to Bohm's hypothesis is verification. In his writings, Bohm never proposed any specific means by which the propositions could be tested or falsified, nor a neural mechanism through which his "implicate order" could emerge in a way relevant to consciousness.[8] Bohm did, however, collaborate on Karl Pribram's holonomic brain theory as a model of quantum consciousness.[10]

According to philosopher Paavo Pylkkänen, Bohm's suggestion "leads naturally to the assumption that the physical correlate of the logical thinking process is at the classically describable level of the brain, while the basic thinking process is at the quantum-theoretically describable level."[11]

Roger Penrose and Stuart Hameroff

Theoretical physicist Roger Penrose and anaesthesiologist Stuart Hameroff collaborated to produce the theory known as Orchestrated Objective Reduction (Orch-OR). Penrose and Hameroff initially developed their ideas separately and only later collaborated to produce Orch-OR in the early 1990s. The theory was reviewed and updated by the original authors in late 2013.[12][13]

Penrose's controversial argument stemmed from equivocation on the meaning of computation.[15]

Penrose determined wave function collapse was the only possible physical basis for a non-computable process. Dissatisfied with its randomness, Penrose proposed a new form of wave function collapse that occurred in isolation and called it objective reduction. He suggested each quantum superposition has its own piece of spacetime curvature and when these become separated by more than one Planck length they become unstable and collapse.[16] Penrose suggested that objective reduction represented neither randomness nor algorithmic processing but instead a non-computable influence in spacetime geometry from which mathematical understanding and, by later extension, consciousness derived.[16]

Originally, Penrose lacked a detailed proposal for how quantum processing could be implemented in the brain. However, Hameroff read Penrose's work and suggested that microtubules would be suitable candidates.[17] Microtubules are composed of tubulin protein dimer subunits. The tubulin dimers each have hydrophobic pockets that are 8 nm apart and which may contain delocalized pi electrons. Tubulins have other smaller non-polar regions that contain pi electron-rich indole rings separated by only about 2 nm. Hameroff proposed that these electrons are close enough to become quantum entangled.[18] Hameroff originally suggested the tubulin-subunit electrons would form a Bose–Einstein condensate, but this was discredited.[19] He then proposed a Frohlich condensate, a hypothetical coherent oscillation of dipolar molecules. However, this too has been experimentally discredited.[20]

Furthermore, he proposed that condensates in one neuron could extend to many others via gap junctions between neurons forming a macroscopic quantum feature across an extended area of the brain. When the wave function of this extended condensate collapsed, it was suggested to non-computationally access mathematical understanding and ultimately conscious experience which are hypothetically embedded in the geometry of spacetime.

However, Orch-OR made numerous false biological predictions, and is considered by some to be an extremely poor model of brain physiology. The proposed predominance of 'A' lattice microtubules, more suitable for information processing, was falsified by Kikkawa et al.,[21][22] who showed all in vivo microtubules have a 'B' lattice and a seam. The proposed existence of gap junctions between neurons and glial cells was also falsified.[23] Orch-OR predicted that microtubule coherence reaches the synapses via dendritic lamellar bodies (DLBs), however De Zeeuw et al. proved this impossible,[24] by showing that DLBs are located micrometers away from gap junctions.[25]

In January 2014, Hameroff and Penrose announced the discovery of quantum vibrations in microtubules by Anirban Bandyopadhyay of the National Institute for Materials Science in Japan in March 2013[26] confirms the hypothesis of the Orch-OR theory.[13][27]

In early 2015 it was revealed that pulsed transcranial ultrasound seems to improve memory functioning in Alzheimer's mice as well as helping to break down amyloid plaques.[28] This could still be relevant to Orch-OR as originally theorized by the page authors ultrasound is actually just activating latent brain repair and cleanup mechanisms; if it was also helping to boost the disease weakened cemi field within the neurons directly in a similar way to adding noise to a signal sometimes boosts it above the noise floor then a similar high frequency ultrasound transmitter tuned to the specific microtubule vibrations could work even in a PVS patient.

Umezawa, Vitiello, Freeman

Hiroomi Umezawa and collaborators proposed a quantum field theory of memory storage. Giuseppe Vitiello and Walter Freeman have proposed a dialog model of the mind. This dialog takes place between the classical and the quantum parts of the brain.[29][30] Their quantum field theory models of brain dynamics are fundamentally different from the Penrose-Hameroff theory.

Karl Pribram

Karl Pribram's holonomic brain theory (quantum holography) invoked quantum mechanics to explain higher order processing by the mind.[31][32] He argued the holonomic model solved the binding problem.[33] Pribram collaborated with Bohm in his work on the quantum approaches to mind and he provided evidence on how much of the processing in the brain was done in wholes.[34] He proposed that ordered water at dendritic membrane surfaces might operate by structuring Bose-Einstein condensation supporting quantum dynamics.[35]

Although Subhash Kak's work is not directly related to that of Pribram, he likewise proposes the physical substratum to neural networks has a quantum basis,[36][37] but he asserts that the quantum mind will still have machine-like limitations.[38] He points to a role for quantum theory in the distinction between machine intelligence and biological intelligence, but that in itself cannot explain all aspects of consciousness.[39][40]

Henry Stapp



The main argument against the quantum mind proposition is that quantum states in the brain would decohere before they reached a spatial or temporal scale at which they could be useful for neural processing. This argument was elaborated by the physicist, Quantum biology.[46]

Since the 90s, however, numerous counter-observations to the "warm, wet and noisy" argument have been found to exist at normal temperatures, in-vitro,[47][48] or inside living organisms (i.e. photosynthesis, bird navigation). For example, Harvard researchers have been able to achieve quantum states lasting for nearly two seconds at room temperatures using pure diamonds.[49] In the past six years, evidence has accumulated that plants routinely use quantum coherent electron transport at ambient temperatures in photosynthesis.[50] More recently (2014), a team at University of Arizona using theoretical quantum biophysics and computer simulations analyzed quantum coherence among tryptophan π resonance rings in tubulin, the component protein in microtubules, and claimed that quantum dipole coupling among tryptophan π resonance clouds, mediated by exciton hopping or Forster resonance energy transfer (FRET) across the tubulin protein are plausible.[51]

See also


  1. ^ "Quantum Approaches to Consciousness". Stanford Encyclopedia of Philosophy. May 19, 2011 [First published Tue Nov 30, 2004]. 
  2. ^ Dyson, Freeman (2004). Infinite in All Directions: Gifford Lectures Given at Aberdeen, Scotland April--November 1985 (1st Perennial ed.). New York: Perennial. p. 297.  
  3. ^ Searle, John R. (1997). The Mystery of Consciousness (1. ed.). New York: New York Review of Books. pp. 53–88.  
  4. ^  
  5. ^ Stephen P. Stich; Ted A. Warfield (15 April 2008). The Blackwell Guide to Philosophy of Mind. Blackwell Philosophy Guides (John Wiley & Sons). p. 126.  
  6. ^ David J. Chalmers (1995). "Facing Up to the Problem of Consciousness". Journal of Consciousness Studies 2 (3): 200–219. 
  7. ^ Chalmers, David J. (1997). The Conscious Mind: In Search of a Fundamental Theory (Paperback ed.). New York: Oxford University Press.  
  8. ^ a b Bohm, David (2002). Wholeness and the Implicate Order. (Online-Ausg. ed.). Hoboken: Routledge.  
  9. ^ Piaget, Jean (1997). Jean Piaget: selected works. (The Origin of Intelligence in the Child) (Repr. ed.). London: Routledge.  
  10. ^ Wade, Jenny (1996). Changes of Mind: A Holonomic Theory of the Evolution of Consciousness. Albany: State Univ. of New York Press.  
  11. ^ Paavo Pylkkänen. "Can quantum analogies help us to understand the process of thought?" (PDF). Mind & Matter 12 (1): 61–91.  p. 75.
  12. ^ unattributed (2014-01-16). "Discovery of Quantum Vibrations in...". Retrieved 2014-01-16. 
  13. ^ a b "Discovery of Quantum Vibrations in "Microtubules" Inside Brain Neurons Corroborates Controversial 20-Year-Old Theory of Consciousness". Elsevier. Retrieved 2014-08-04. 
  14. ^ Gödel, Kurt (1992). On Formally Undecidable Propositions of Principia Mathematica and Related Systems (Reprint. ed.). New York: Dover Publications.  
  15. ^ Bringsjord, S. and Xiao, H. 2000. A Refutation of Penrose's Gödelian Case Against Artificial Intelligence. Journal of Experimental and Theoretical Artificial Intelligence
  16. ^ a b Penrose, Roger (1999). The Emperor's New Mind: Concerning Computers, Minds, and the Laws of Physics ([New edition] ed.). Oxford: Oxford Univ. Press.  
  17. ^ Penrose, Roger (1995). Shadows of the Mind: A Search for the Missing Science of Consciousness (Repr. (with corrections). ed.). Oxford [u.a.]: Oxford Univ. Press.  
  18. ^  
  19. ^ Roger Penrose & Stuart Hameroff (2011). "Consciousness in the Universe: Neuroscience, Quantum Space-Time Geometry and Orch OR Theory". Journal of Cosmology 14. 
  20. ^ Reimers, Jeffrey R.; McKemmish, Laura K.; McKenzie, Ross H.; Mark, Alan E.; Hush, Noel S. (17 March 2009). "Weak, strong, and coherent regimes of Fröhlich condensation and their applications to terahertz medicine and quantum consciousness". PNAS 106 (11): 4219–4224.  
  21. ^ Kikkawa, M., Ishikawa, T., Nakata, T., Wakabayashi, T., Hirokawa, N. (1994). "Direct visualization of the microtubule lattice seam both in vitro and in vivo". Journal of Cell Biology 127 (6): 1965–1971.  
  22. ^ Kikkawa, M., Metlagel, Z. (2006). "A molecular "zipper" for microtubules". Cell 127 (7): 1302–1304.  
  23. ^ F. J. Binmöller & C. M. Müller (1992). "Postnatal development of dye-coupling among astrocytes in rat visual cortex". Glia 6 (2): 127–137.  
  24. ^ De Zeeuw, C.I., Hertzberg, E.L., Mugnaini, E. (1995). "The dendritic lamellar body: A new neuronal organelle putatively associated with dendrodentritic gap junctions". Journal of Neuroscience 15 (2): 1587–1604.  
  25. ^ "Consciousness, the brain, and spacetime geo... [Ann N Y Acad Sci. 2001] - PubMed - NCBI". 2013-08-12. Retrieved 2014-01-16. 
  26. ^ "Atomic water channel controlling remarka... [Biosens Bioelectron. 2013] - PubMed - NCBI". 2014-05-14. Retrieved 2014-07-30. 
  27. ^ Osborne, Hannah (2014-01-16). "Quantum Vibrations in Brain Opens 'Pandora's Box' of Theories of Consciousness - Yahoo News UK". Retrieved 2014-08-04. 
  28. ^ "Ultrasound 'breakthrough' in treating Alzheimer's - in mice - Health News - NHS Choices". 2015-03-12. Retrieved 2015-03-31. 
  29. ^ G. Vitiello, My Double Unveiled. John Benjamins, 2001.
  30. ^ Freeman, W. and G. Vitiello, Nonlinear brain dynamics as macroscopic manifestation of underlying many-body dynamics. Physics of Life Reviews, vol. 3, pp 93-118, 2006.
  31. ^ Pribram, K. H. (1999). Quantum holography: Is it relevant to brain function? Information Sciences, 115(1–4), 97–102.
  32. ^ Pribram, K.H. (2004). Consciousness Reassessed. Mind and Matter, 2, 7–35.
  33. ^ Pribram, K. (1999) Status Report: Quantum Holography and the Braln. Acta Polyiechnica Scandinavica: Emergence Complexity, Hierarchy, Organization, Vol. 2, pp. 33-60.
  34. ^ Pribram, K.H. Holography, holonomy and brain function. Elsevier's Encyclopedia of Neuroscience, 1999.
  35. ^ Jibu, M., Pribrm, K. H., & Yasue, K. (1996). From conscious experience to memory storage and retrieval: The role of quantum brain dynamics and boson condensation of evanescent photons. International Journal of Modern Physics B, 10, 1735-1754.
  36. ^ Kak, S. (1995) Quantum neural computing, In Advances in Imaging and Electron Physics, vol. 94, P. Hawkes (editor). Academic Press, 259-313.
  37. ^ Kak, S. (1996) The three languages of the brain: quantum, reorganizational, and associative. In Learning as Self- Organization, K. Pribram and J. King (editors). Lawrence Erlbaum Associates, Mahwah, NJ, 185-219.
  38. ^ Gautam, A. and S. Kak (2013), Symbols, meaning, and origins of mind. Biosemiotics (Springer Verlag) 6: 301-310.
  39. ^ Kak, S. (2000), Active agents, intelligence, and quantum computing. Information Sciences 128: 1-17.
  40. ^ Kak, S. (2005), Artificial and biological intelligence. ACM Ubiquity 6 (42): 1-22.
  41. ^ Bourget, D. (2004). "Quantum Leaps in Philosophy of Mind: A Critique of Stapp's Theory".  
  42. ^ a b c Georgiev, D. (2012). "Mind efforts, quantum Zeno effect and environmental decoherence".  
  43. ^ a b Georgiev, D. (2015). "Monte Carlo simulation of quantum Zeno effect in the brain".  
  44. ^ Tegmark, M. (2000). "Importance of quantum decoherence in brain processes". Physical Review E 61 (4): 4194–4206.  
  45. ^ Charles Seife (4 February 2000). "Cold Numbers Unmake the Quantum Mind". Science 287 (5454): 791.  
  46. ^ Engel, G. (2007). "Evidence for wavelike energy transfer through quantum coherence in photosynthetic systems". Nature 446 (7137): 782–786.  
  47. ^ "Discovery of Quantum Vibrations in "Microtubules" Inside Brain Neurons Corroborates Controversial 20-Year-Old Theory of Consciousness". (press release). Amsterdam:  
  48. ^ Anirban Bandyopadhyay (26 March 2013). "Multi-level memory-switching properties of a single brain microtubule". Applied Physics Letter (American Institute of Physics) 102 (12).  
  49. ^ Baron, David. "Quantum computing, no cooling required | Harvard Gazette". Retrieved 2014-07-28. 
  50. ^ Engel, G.S., Calhoun, T.R., Read, E.L., Ahn, T.-K., Mancal, T., Cheng, Y.-C., Blankenship, R.E., and Fleming, G.R. (2007). "Evidence for wavelike energy transfer through quantum coherence in photosynthetic systems". Nature 446 (7137): 782–786.  
  51. ^ Craddock, Travis John Adrian; Friesen, Douglas; Mane, Jonathan; Hameroff, Stuart; Tuszynski, Jack (17 Sep 2014). "The feasibility of coherent energy transfer in microtubules". Journal of the Royal Society – Interface 11 (100): 1742–5662.  

Further reading

  • Flanagan, Brian. Are Perceptual Fields Quantum Fields?
  • Hodgson, David. The Mind Matters. Oxford University Press, 1993.
  • Koch, C. and Hepp, K., "Quantum mechanics in the brain", Nature 440, 611 (30 March 2006)
  • Litt et al., "Is the Brain a Quantum Computer?", Cognitive Science (2006)
  • Lockwood, Michael. Mind, Brain and the Quantum. Cambridge, Massachusetts: Basil Blackwell Ltd., 1989.
  • McFadden, Johnjoe (2000) Quantum Evolution HarperCollins. ISBN 0-00-255948-X; ISBN 0-00-655128-9 . Final chapter on the quantum mind.
  • Pharaoh, M.C. (online). Looking to quantum mechanics for a reductive explanation of the noumenon of consciousness Retrieved June.21 2008.
  • Schrödinger, Erwin. Mind and Matter. Cambridge University Press, 1959.
  • Weyl, Hermann. Mind and Nature, University of Pennsylvania Press, 1934.
  • Wigner, Eugene. "Physics and the Explanation of Life", in Foundations of Physics, vol. 1, 1970, pp. 34–45.

External links

  • Center for Consciousness Studies, directed by Stuart Hameroff
  • Online papers on consciousness
  • Quantum Approaches to ConsciousnessStanford Univ. Encyclopedia of Philosophy critical survey article Harald Altmanspacher (2006)
  • "What is an Essentially Quantum Mechanical Effect?", Osvaldo Pessoa Jr.
  • Quantum-Mind
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.