Brain neurons as quantum computers: {\it in vivo} support of background physics

Details Brain neurons as quantum computers: {\it in vivo} support of background physics Brain neurons as quantum computers: {\it in vivo} support of background physics

2003-11-19

arxiv.org/abs/q-bio/0311026v1

Internatioanl Journal of Modern Physics C: 14, 897-904 (2003)

Biology

Quantitative Biology

Neurons and Cognition

Scientific paper

10.1142/S0129183103005030

The question: whether quantum coherent states can sustain decoherence, heating and dissipation over time scales comparable to the dynamical timescales of the brain neurons, is actively discussed in the last years. Positive answer on this question is crucial, in particular, for consideration of brain neurons as quantum computers. This discussion was mainly based on theoretical arguments. In present paper nonlinear statistical properties of the Ventral Tegmental Area (VTA) of genetically depressive limbic brain are studied {\it in vivo} on the Flinders Sensitive Line of rats (FSL). VTA plays a key role in generation of pleasure and in development of psychological drug addiction. We found that the FSL VTA (dopaminergic) neuron signals exhibit multifractal properties for interspike frequencies on the scales where healthy VTA dopaminergic neurons exhibit bursting activity. For high moments the observed multifractal (generalized dimensions) spectrum coincides with the generalized dimensions spectrum calculated for a spectral measure of a {\it quantum} system (so-called kicked Harper model, actively used as a model of quantum chaos). This observation can be considered as a first experimental ({\it in vivo}) indication in the favour of the quantum (at least partially) nature of the brain neurons activity.

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