The MANCOVA model for the GO condition showed a significant effect of age (F(6,26) = 6.53, p < 0.001) but not diagnosis (Fig. 1). Univariate ANCOVA models showed age to be significantly related to P3 latency at Fz (F(1,31) = 22.32, p < 0.001), Cz (F(1,31) = 26.81, p < 0.001), and Pz (F(1,31) = 20.85, p < 0.001) and on P3 amplitude at Fz (F(1,31) = 19.07, p < 0.001) and Cz (F(1,31) = 4.59, p = 0.040). Neither total power (Fig. 2) nor phase-locking factor for the δ or θ bands showed age or diagnosis effects at Fz, Cz, or Pz.
