Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                

Oscillations and chaos in neural networks: an exactly solvable model

Proc Natl Acad Sci U S A. 1990 Dec;87(23):9467-71. doi: 10.1073/pnas.87.23.9467.

Abstract

We consider a randomly diluted higher-order network with noise, consisting of McCulloch-Pitts neurons that interact by Hebbian-type connections. For this model, exact dynamical equations are derived and solved for both parallel and random sequential updating algorithms. For parallel dynamics, we find a rich spectrum of different behaviors including static retrieving and oscillatory and chaotic phenomena in different parts of the parameter space. The bifurcation parameters include first- and second-order neuronal interaction coefficients and a rescaled noise level, which represents the combined effects of the random synaptic dilution, interference between stored patterns, and additional background noise. We show that a marked difference in terms of the occurrence of oscillations or chaos exists between neural networks with parallel and random sequential dynamics.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Association Learning
  • Mathematics
  • Memory
  • Models, Neurological*
  • Neurons / physiology*