Figure 4.

Causal state machines (CSMs) reconstructed and their corresponding relative frequency distributions obtained from depressing FD model. Model is stimulated by Poisson spike trains with mean firing rates (A) 0.1, (B) 2, (C) 5, and (D) 100 Hz. The transitions between states are indicated with symbol emitted during the transition (1, large synaptic response; 0, small synaptic response) and the transition probability. In both (A,D), CSMs for 0.1 and 100 Hz Poisson spiking process consist of a single state “1” which transitions back to itself, emitting a large response with probabilities 0.9 and 0.06 for low and very high mean firing rates, respectively. In both (B,C), 2-state CSMs reconstructed for 2 and 5 Hz Poisson spiking process emit large response with nearly similar probabilities.