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Proceedings Paper

How much power does neural signal propagation need?
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Paper Abstract

Two well known, biologically inspired non-dynamical models of stochastic resonance, the threshold-crossing model and the fluctuating rate model are analyzed in terms of channel information capacity and dissipation of energy necessary for small-signal transduction. Using analogies to spike propagation in neurons we postulate the average output pulse rate as a measure of dissipation. The dissipation increases monotonically with the input noise. We find that for small dissipation both models give an asymptotically linear dependence of the channel information capacity on dissipation. In both models the channel information capacity, as a function of dissipation, has a maximum at input noise amplitude that is different from that in the standard signal-to-noise ration vs. input noise plot. Though a direct comparison is not straightforward, for small signals the threshold model gives appreciably higher density of information per dissipation than the exponential fluctuating rate model. We show that a formal introduction of cooperativity in the rate fluctuating model permits us to imitate the response function of the threshold model and to enhance performance. This finding may have direct relevance to real neural spike generation where, due to a strong positive feedback, the ion channel currents are adding up in a synchronized way.

Paper Details

Date Published: 19 November 2001
PDF: 5 pages
Proc. SPIE 4590, BioMEMS and Smart Nanostructures, (19 November 2001); doi: 10.1117/12.454600
Show Author Affiliations
Sergey M. Bezrukov, National Institutes of Health and St. Petersburg Nuclear Physics Insititute (United States)
Laszlo B. Kish, Texas A&M Univ. (United States)


Published in SPIE Proceedings Vol. 4590:
BioMEMS and Smart Nanostructures
Laszlo B. Kish; Erol C. Harvey; William B. Spillman, Editor(s)

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