Dependence of the cueing effects in V1 on the cue-to-probe SOA in the fixation task. A, Normalized population PSTHs (10 ms bins) at six SOAs for the cue-on and cue-away conditions, respectively. Recording sites from the 3 animals were pooled (n = 87 from 27, 38, and 22 sites in Monkeys MH, MI, and MJ, respectively, except for SOA = 600 ms where Monkey MJ was not tested). The number of trials at each SOA in each cue condition was 100, 250, and 150 for Monkeys MH, MI, and MJ, respectively. In this experiment, the contrast of probe gratings was 10% for Monkeys MI and MJ, and 15% for Monkey MH. B, Mean cue-induced modulations in V1 as a function of SOA for each of the three time windows marked by colored bars in A. Error bars indicate ± SEM.