Figure 1. .

Grand-average event-related potentials (ERPs) for the three conditions, plotted at three midline electrode sites. In this and subsequent figures, negative is plotted up, and all waveforms were low-pass filtered at 15 Hz for presentation purposes. Bar graphs to the right show average voltages within each spatiotemporal region of interest (see text) with ±1 standard error of the mean (SEM) error bars, calculated within-subject (Morey, 2008).