(A) The top panel shows the cumulative distribution of all 249 grand-average SPNs. The smallest SPN is at the left-most end of the x-axis, and the largest SPN is at the right-most end. The blue line is comprised 249 data points, and the black lines show 95% confidence intervals. If the upper confidence interval does not rise above zero, we have a significant SPN (P<.05, two-tailed). The middle panel shows that the 134 unpublished SPNs in the file drawer (red) are smaller (i.e., less negative) than the 115 published SPNs in the literature (green). The bottom panel shows a funnel plot of 249 grand-average SPNs arranged by mean (x-axis) and standard error (y-axis). Red dots are unpublished SPNs, green dots are published SPNs. Dots to the left of the blue central triangle represent significant SPNs (inner edge, P<.05, outer edge, P<.01); if dots are inside the blue triangle, the effect is non-significant. (B) Equivalent set of plots for the peak amplitude P1 on regular trials. (C) Equivalent set of plots for the trough amplitude N1 on regular trials.