Instabilities in associative memory model with synaptic depression and switching phenomena among attractors

Details Instabilities in associative memory model with synaptic depression and switching phenomena among attractors Instabilities in associative memory model with synaptic depression and switching phenomena among attractors

2010-05-21

arxiv.org/abs/1005.3916v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

18pages,6figures

Scientific paper

We investigated how the stability of macroscopic states in the associative memory model is affected by synaptic depression. To this model, we applied the dynamical mean-field theory, which has recently been developed in stochastic neural network models with synaptic depression. By introducing a sublattice method, we derived macroscopic equations for firing state variables and depression variables. By using the macroscopic equations, we obtained the phase diagram when the strength of synaptic depression and the correlation level among stored patterns were changed. We found that there is an unstable region in which both the memory state and mixed state cannot be stable and that various switching phenomena can occur in this region.

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