Re: Quantum entaglement, human cognitive capacity

From: Krekoski Ross (
Date: Sun Mar 02 2008 - 18:13:48 MST

> Read this:
> The importance of quantum decoherence in brain processes
> Max Tegmark
Its a good paper. One claim however:

"as soon as ... a quantum
subsystem communicates with the constantly decohering
neurons to create conscious experience, everything decoheres"

I have a problem with--- Even if the alleged underlying quantum system
interacts on a macro level at a specific point in time, it doesnt imply that
the entire macro process is subject at all times to quantum decoherence.

In general though I think its a strong argument.



> Abstract:
> Based on a calculation of neural decoherence rates, we argue that that
> the degrees of freedom of the human brain that relate to cognitive
> processes should be thought of as a classical rather than quantum
> system, i.e., that there is nothing fundamentally wrong with the current
> classical approach to neural network simulations. We find that the
> decoherence timescales ~10^{-13}-10^{-20} seconds are typically much
> shorter than the relevant dynamical timescales (~0.001-0.1 seconds),
> both for regular neuron firing and for kink-like polarization
> excitations in microtubules. This conclusion disagrees with suggestions
> by Penrose and others that the brain acts as a quantum computer, and
> that quantum coherence is related to consciousness in a fundamental way.
> Cheers,
> GŁnther
> --
> GŁnther Greindl
> Department of Philosophy of Science
> University of Vienna
> Blog:
> Site:

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