Fig. 12.

Dependence of HFOPs on integration step size. (a_1–2) mCCHs, combining data from all distinct cell pairs stimulated by a square spot covering an 8 × 8 array of ganglion cells (intensity = 0.5, 10 trials). (a₁) Standard model and integration parameters. (a₂) The integration time step was reduced to 0.01 ms and all axonal delays set equal to 2.5 ms. HFOPs were very similar to those obtained with the standard time step and axonal delays, showing that model behavior is independent of step size to within a simple change of parameters. (b_1–2) mPSTHs, computed from the same data as the corresponding mCCH to the left, were mostly unaffected by step size. (c) Model behavior vs. step size. The plateau firing rate (squares), synchrony (circles), and total gamma power (diamonds) reach asymptote for step sizes below approximately 0.25 ms, consistent with the 1-ms rise time of both post-synaptic potentials and artificial spikes in the model.