within families was fit to the Time 1 P300 amplitude of the paternal AAB group using PROC MIXED. This analysis was restricted to only the 40 men with data from the first and last assessments. In this group target, amplitude (M = 22.72 µV, SE = 1.17) was significantly greater than neutral P300 amplitude (M = 11.94 µV, SE = 1.03) at Time 1, F(1, 24) = 109.58, p <.001. This 10.78 µV (SE = 1.03) difference was substantially greater than the observed decline of 3.72 µV (SE = 0.90) in target P300 amplitude from Time 1 to Time 3 in this group, suggesting that their reduced slope for target amplitude cannot be readily attributed to a floor effect.
