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Neuron dynamics and chaotic synchronization

  Articoli su Riviste JCR/ISI  (anno 2005)

Autori:  Arecchi F

Affiliazione Autori:  Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy; Univ Florence, Dept Phys.

Riassunto:  At the borderline between neuroscience and physics of complex phenomena, a new paradigm is under investigation, namely feature binding. This terminology denotes how a large collection of coupled neurons combines external signals with internal memories into new coherent patterns of meaning. An external stimulus spreads over an assembly of coupled neurons, building up a corresponding collective state. Thus, the synchronization of spike trains of many individual neurons is the basis of a coherent perception. Based on recent investigations, a novel conjecture for the dynamics of single neurons and, consequently, for neuron assemblies has been formulated. Homoclinic chaos is proposed as the most suitable way to code information in time by trains of equal spikes occurring at apparently erratic times; a new quantitative indicator, called propensity, is introduced to select the most appropriate neuron model. In order to classify the set of different perceptions, the percept space is given a metric structure by introducing a distance measure between distinct percepts. The distance in percept space is conjugate to the duration of the perception in the sense that an uncertainty relation in percept space is associated with time limited perceptions. (Thus coding of different percepts by synchronized spike trains entails fundamental quantum features. It is conjectured that they are related to the details of the perceptual chain rather than depending on Planck's action).

Volume n.:  5 (2)      Pagine da: L163  a: L173

*Impact Factor della Rivista: (2005) 0.650   *Citazioni: 2
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  12/05/2019

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