### Neural Unpredictability, The Interpretation of Quantum Theory,
and The Mind-Body Problem.

#### quant-ph/0208033

** Abstract ** It has been suggested, on the one hand, that
quantum states are just states of knowledge; and, on the other, that
quantum theory is merely a theory of correlations. These suggestions
are confronted with problems about the nature of psycho-physical
parallelism and about how we could define probabilities for our
individual future observations given our individual present and
previous observations. The complexity of the problems is underlined
by arguments that unpredictability in ordinary everyday neural
functioning, ultimately stemming from small-scale uncertainties in
molecular motions, may overwhelm, by many orders of magnitude,
many conventionally recognized sources of observed “quantum”
uncertainty. Some possible ways of avoiding the problems are
considered but found wanting. It is proposed that a complete
understanding of the relationship between subjective experience and
its physical correlates requires the introduction of mathematical
definitions and indeed of new physical laws.

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#### Matthew J. Donald

#### The Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, Great
Britain.

#### e-mail : mjd1014@cam.ac.uk

#### home page:
http://people.bss.phy.cam.ac.uk/~mjd1014