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Paper   IPM / Cognitive / 7432
School of Cognitive Sciences
  Title:   New attractor states for synchronous activity in synfire chains with excitatory and inhibitory coupling
1.  A. Yazdanbakhsh
2.  B. Babadi
3.  S. Rouhani
4.  E. Arabzadeh
5.  A.H. Abbasian
  Status:   Published
  Journal: BIOL CYBERN
  No.:  5
  Vol.:  86
  Year:  2002
  Pages:   367-378
  Supported by:  IPM
In a feedforward network of integrate-and-fire neurons, where the firing of each layer is synchronous (synfire chain), the final firing state of the network converges to two attractor states: either a full activation or complete fading of the tailing layers. In this article, we analyze various modes of pattern propagation in a synfire chain with random connection weights and delta type postsynaptic currents. We predict analytically that when the input is fully synchronized and the network is noise free, varying the characteristics of the weights distribution would result in modes of behavior that are different from those described in the literature. These are convergence to fixed points, limit cycles, multiple periodic, and possibly chaotic dynamics. We checked our analytic results by computer simulation of the network, and showed that the above results can be generalized when the input is asynchronous and neurons are spontaneously active at low rates.

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