Adaptation decreases spike-timing precision in NM. A, Example of a “frozen noise” stimulus used to measure changes in spike jitter; a and b indicate identical noise segments. B, Response of an NM neuron to three repeats of the stimulus shown in A. The numbered rasters show the time of spikes during noise segment a (top raster; black) and during noise segment b (bottom raster; blue, “old” spikes; red, “new” spikes). C, Change in spike jitter for early (200–700 ms after stimulus onset) and late response (4200–4700 ms) (gray crosses, individual cells; black diamonds, group average; n = 13; p = 0.4; error bars represent SE). D, Mean spike jitter versus spike type (see text) (n = 8; *p < 0.05, paired t test). Error bars represent SE.