A. ON-cells. Effect of lateral PB microinjection of aCSF (200 nl), lidocaine (4%, 200 nl), or muscimol (8 pmol in 200 nl) on the ON-cell burst (measured as total evoked spikes). B. OFF-cells. Effect of lateral PB microinjection of aCSF, lidocaine, or muscimol on OFF-cell pause (measured as pause duration). (PB injections were contralateral to the peripheral stimulus. Reported as geometric mean with 95% confidence limits, *p < 0.05 compared to baseline, t-test for correlated means, n = 8 to 11 cells per class/treatment.)