Transition from regular to complex behaviour in a discrete deterministic asymmetric neural network model

Details Transition from regular to complex behaviour in a discrete deterministic asymmetric neural network model Transition from regular to complex behaviour in a discrete deterministic asymmetric neural network model

1993-04-16

arxiv.org/abs/cond-mat/9304026v1

J.Phys. A26 (1993) 3441-3454

Physics

Condensed Matter

18 pages + 6 figures, TeX dialect: Plain TeX + IOP macros (included)

Scientific paper

10.1088/0305-4470/26/14/011

We study the long time behaviour of the transient before the collapse on the periodic attractors of a discrete deterministic asymmetric neural networks model. The system has a finite number of possible states so it is not possible to use the term chaos in the usual sense of sensitive dependence on the initial condition. Nevertheless, at varying the asymmetry parameter, $k$, one observes a transition from ordered motion (i.e. short transients and short periods on the attractors) to a ``complex'' temporal behaviour. This transition takes place for the same value $k_{\rm c}$ at which one has a change for the mean transient length from a power law in the size of the system ($N$) to an exponential law in $N$. The ``complex'' behaviour during the transient shows strong analogies with the chaotic behaviour: decay of temporal correlations, positive Shannon entropy, non-constant Renyi entropies of different orders. Moreover the transition is very similar to that one for the intermittent transition in chaotic systems: scaling law for the Shannon entropy and strong fluctuations of the ``effective Shannon entropy'' along the transient, for $k > k_{\rm c}$.

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