Figure 5 :Raw EEG over a 16-s epoch for a single subject. A stimulus was presented after 8 s (i.e., time 0). In the upper portion of the figure, an N350 is visible in the raw EEG (open arrow). In the lower portion of the figure, a K-Complex has been elicited, consisting of the N350 and a later N550 (closed arrow). The N350 and N550 are so large that they can be observed in a single trial.