Task-related ERPs and their association with RT by congruency.

<p>ERP amplitudes are plotted for different RT groups by task and stimulus type (congruous vs. incongruous) for (A) the left-frontotemporal negativity (FT7, 250–700 ms), (B) the midline-frontal negativity (Fz, 450–800 ms), and (C) the centroparietal positivity (CP2, 450–800 ms). Significant differences of ERP amplitudes between RT groups were marked (** <i>p</i> < 0.01, * <i>p</i> < 0.05). Because of the small number of trials available for analysis two RT groups (fast and slow) instead of three RT groups were used.