Development of response latency in PMLS and V1. A, Raster plots for example V1 (left) or PMLS (right) MU sites, recorded at different ages (indicated in top left in each plot). The dashed line indicates stimulus onset at 0 ms; the red line indicates the latency computed for every site (also listed in each plot). B, Average MU latency computed for each animal, as a function of the animal's age. The circle size indicates the SEM for each animal, with the scale for the per-animal SEM indicated in the legend. Red and blue bands indicate average latency in adult animals (40 d and older), ±1 SEM. C, Cumulative distribution of MU latencies for V1 and PMLS, divided into the standard three age groups. The legend summarizes the outcomes of rank-sum tests between groups (solid line, p < 0.01). D, Average latency in 2 d age bins from P29 to 38, and from P40 to 52, for V1 and PMLS (no normalization). Data points are plotted at the middle of each age bin. Error bars indicate SEM. E, p values resulting from rank-sum ‘tests’ comparing V1 and PMLS latencies for each animal individually. P values are plotted as a function of the animal's age and are Bonferroni-corrected to account for multiple comparisons. The red line indicates a p value of 0.01.