Figure 2.

Cell 1: temporal shifts of inhibition affect PSP height. Left, Conductance waveforms. Red, Excitation; blue, inhibition. Middle, Computed PSPs. Black, Control; gray, shifted inhibition. Dashed ± gray line is spike threshold ± SD. Right, Change in PSP height plotted against the time shift of inhibition. a, Preferred. Every temporal shift of inhibition increased PSP height. Because firing probability was ∼70%, any increase in PSP height would likely increase firing probability. b, Null. The control PSP was so far from spike threshold that large delays of inhibition (4–5 ms) would be needed to evoke spikes.