Figure 8.

Typical example of tWTA competition between two populations of 50 neurons during a single trial in which a series of five alternating stimuli were presented every 60 ms. Thus, for the first presentation T = 20 ms, for the second T = 80 ms, and so on. Each stimulus lasted ΔT = 50ms. During the odd presentations (first, third, fifth…) population 1 received the faster input whereas in the even presentations population 2. (A) Population raster plot. Each row shows the spike times of a single neuron (black dots). Bottom half shows neurons from population 1, and upper half population 2. The open circles depict the specific input latency times for each neuron (T + τ_a + δ_{a, i}) in different colors for the different presentations. The thick horizontal lines show the mean times in which each population received input; i.e., from time T + τ_a to time T + ΔT + τ_a. (B) The population firing rate for population 1 (green) and population 2 (blue). The rate was estimated by the total spike count in a sliding window of a 10 ms time bin. Horizontal black line shows the decision threshold of 3.5 spikes/ms used to generate C. (C) The decision of the tWTA network. In this simulations we used τ = 0ms for the preferred stimulus, τ = 5ms to the non-preferred stimulus, and $g_L=1.1{\text{mS}/\text{cm}}^2$.