FIGURE 7.

Neural firing time map with delays of arbitrary lengths for a circuit of two pulse coupled neurons. Only two out of the four possible firing patterns are shown. The delay between a spike in neuron 1 (2) and the receipt of an input by neuron 2 (1) is designated δ₁ (δ₂). The delay between a spike in neuron 1 (2) and the receipt of an input by neuron 2 (1) is designated δ₁ (δ₂). (A) The quantities highlighted in gray sum to k cycles in neuron 1. The number of spikes that occur in neuron 2 during δ₁ is j₂. (B) The quantities highlighted in gray sum to k cycles in neuron 2. The number of spikes that occur in neuron 1 during δ₂ is j₁. Stimulus intervals (ts_i) denote the time elapsed between a spike in neuron i and the receipt of the next input by neuron i, whereas recovery intervals (tr_i) denote the time elapsed between the receipt of an input by neuron i and the next spike in neuron i. The time intervals are variable and indexed by cycle number n.