Fig. 2.

Grand-average ERPs at the 13 electrode sites that were analyzed in the present study. ERPs are depicted for single electrodes (F3, Fz, F4, FC5, FC6, C3, Cz, C4, T7, T8, CP5, CP6, and Pz) in response to the standard stimulus (solid gray line), the oddball stimulus from the same category (solid black line), and the oddball stimulus from the contrasting category (broken black line). Gray areas depict the time windows during which Nc peak amplitude and Nc peak latency were analyzed (350–700ms) and during which the mean activity of the late slow waves (LSWs) was analyzed (1000–1500ms).