The N2 peak amplitude was measured as the voltage at the largest negative going peak in the latency window of 180–330 ms after stimulus onset. Amplitude and latency measures were calculated using a semi-automatic peak-picking program. The time-window was manually selected for each condition and subject while the peak within the window was automatically detected, measured, and tabulated for all channels. This peak-picking method was similar to the procedure used in other studies (e.g., Kamarajan et al., 2005a) from our laboratory. The amplitude and latency values of N2 peaks for each subject were obtained for each condition and were used in statistical analyses. The grand averages for control and alcoholic groups were computed and plotted (Figure 3a).
