Mirek Dobsicek wrote:
> Somebody might be interested in ..
>
> PHYSICAL REVIEW E 80, 021912 2009
>
> Penrose-Hameroff orchestrated objective-reduction proposal for human
> consciousness is not biologically feasible
It has long been noted that microtubles are ubiquitous in the cells of other organs, not
just in the brain. It is sometimes said that males think with an organ other than the
brain, but this is generally metaphorical.
Brent
>
>>From the abstract:
>
> ------------
> Penrose and Hameroff have argued that the conventional models of a
> brain function based on neural
> networks alone cannot account for human consciousness, claiming that
> quantum-computation elements are also
> required. Specifically, in their Orchestrated Objective Reduction Orch
> OR model R. Penrose and S. R.
> Hameroff, J. Conscious. Stud. 2, 99 1995 , it is postulated that
> microtubules act as quantum processing units,
> with individual tubulin dimers forming the computational elements. This
> model requires that the tubulin is able
> to switch between alternative conformational states in a coherent
> manner, and that this process be rapid on the
> physiological time scale. Here, the biological feasibility of the Orch
> OR proposal is examined in light of recent
> experimental studies on microtubule assembly and dynamics. It is shown
> that the tubulins do not possess
> essential properties required for the Orch OR proposal, as originally
> proposed, to hold. Further, we consider
> also recent progress in the understanding of the long-lived coherent
> motions in biological systems, a feature
> critical to Orch OR, and show that no reformation of the proposal based
> on known physical paradigms could
> lead to quantum computing within microtubules. Hence, the Orch OR model
> is not a feasible explanation of the
> origin of consciousness.
> -----------
>
> Mirek
>
>
> >
>
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Received on Tue Aug 18 2009 - 11:09:13 PDT