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Quantum Computing Day 3: Does an Explanation of Higher Brain Function require...

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Google Tech Talks January, 10 2008 ABSTRACT Syllabus and Recommended Literature This tech talk series explores the enormous opportunities afforded by the emerging field of quantum computing. The exploitation of quantum phenomena not only offers tremendous speed-ups for important algorithms but may also prove key to achieving genuine synthetic intelligence. We argue that understanding higher brain function requires references to quantum mechanics as well. These talks look at the topic of quantum computing from mathematical, engineering and neurobiological perspectives, and we attempt to present the material so that the base concepts can be understood by listeners with no background in quantum physics. In this third talk we review the history of the theory that quantum effects are essential to understanding brain function. We look at the theory of Penrose and Hameroff and its refutation by the decoherence calculations of Tegmark. Our experiments with pattern recognition using a quantum computer teach new lessons on which type of problems the brain may solve by quantum processes and how the data flow might look. Specifically, we conjecture that computations that are not time-critical and which require the solution of a global optimization problem are good candidates for brain processes facilitated by quantum phenomena. We then study situations in which coherence could be maintained to be of behavioral relevance as well as recent findings that show the relevance of coherence in basic biological processes such as photo synthesis and enzyme function. We advance a speculative theory that mental states induced by tryptamines might come about by enhancing the propensity of the brain to relegate certain computations to quantum annealing. We argue that by virtue of being a physical substrate the brain exists in a global superposition with the environment and participates in information exchange via fundamental physical interactions. This regime becomes relevant in situations in which neural dynamics is less driven by sensory input or behavioral affordances. Studying multiple corpora of reports describing experiences mediated by the psychoactive brew ayahuasca, we argue that our model outperforms a more mainstream neurobiological explanation based on neural assemblies. Speaker: Hartmut Neven

Channel: People & Blogs
Uploaded: November 30, 1999 at 12:00 am
Author: googletechtalks

Length: 00:37
Rating: 4.59
Views: 11038

Tags: education  engedu  google  googletechtalks  talk  talks  techtalk  techtalks  

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Video Comments

Provoost (November 30, 1999 at 12:00 am)
This talk feels wrong on too many levels. He compares two boxes, a 'quantum' box that we don't understand and a 'classical' box that we don't understand either. He then proceeds to argue that the effect of certain drugs fit the quantum box better than the classical box. But how can you argue this without a physical or at least computational description of the box? Now it just depends on how much magic you assign to each box. I agree the discussion needs to get back to a small set of neurons.
levlobotomy (November 30, 1999 at 12:00 am)
oh, and ill quote myself as some google fanboys downvoted my statement of pwnage: Scientists have most recently proven that thoughts and decision are formed up to 10 seconds before the person even becomes aware of them. Quantum states are not stable for 10 seconds.
levlobotomy (November 30, 1999 at 12:00 am)
brain: operates on a strategic scale, millions of neurons generate thoughts thoughout large parts of the brain. quantum mechanical source of thought here ? nah, bullshit
levlobotomy (November 30, 1999 at 12:00 am)
atoms arent functional units of the brain
fusionman76 (November 30, 1999 at 12:00 am)
surely you must realize that the qubits on the d-wave aqc are themselves much larger than microtubuli, and can yet perform quantum calculations. And it seems obvious that the microtubules are not the smallest functional unit in the brain, since the'yre by no means atomic. The classical neurodynamics paradigm is not complete or correct.
davidwizard2006 (November 30, 1999 at 12:00 am)
geordie rose who is the founder of the company, give a talk in immortality institute, clearly stated the quantum effect is helpful but not essential in the brain function, because the brain is so warm and wet for quantum computing to carry out, there is no laser, no superconductor and no NMR in there, those things are fairly impossible to be naturally evolved but do not they think quantum computer maybe even a more superiors form of intelligence than the brain spike
davidwizard2006 (November 30, 1999 at 12:00 am)
quantum mechanic is flawed to build such a device, one of my friend told me
iontom (November 30, 1999 at 12:00 am)
Understanding quantum mechanics isn't the issue. It's understanding why taking a measurement collapses probabilities into observables that is the pressing problem. (There are other interpretations of QM, but that's the common Copenhagen interpretation and it is exactly why quantum computers will be so affective.)
wgasa (November 30, 1999 at 12:00 am)
Anyone who is not shocked by quantum theory has not understood it -Niels Bohr
MaBu888 (November 30, 1999 at 12:00 am)
If these theories were bad enough, only then would they be excluded from Google videos.

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