differences in P3 amplitude included an additional within-subject factor of Hemisphere using medial–lateral electrode sites (F3/4; C3/4; P3/4; O1/2). An ANOVA of P3 latency at Pz included Group (depressed, control) as a between-subjects factor and stimulus (novel, target) as a within-subjects factor. Greenhouse-Geisser epsilon (ε) correction was used to compensate for violations of sphericity when appropriate. The sources of significant interactions were systematically examined through simple effects and contrasts between groups. Response accuracy and latency for target stimuli were also analyzed using an ANOVA with the same grouping factor.
