Fig. 2a

Figure 2a. The grand mean response for all 20 nontarget conditions and 20 subjects. Responses at all 29 scalp channels are shown on the same baseline. Note that N1 component peak latency differs at each electrode site. The scalp maps illustrate the continuously shifting potential distribution through the N1 peak. The maps have been scaled individually to their minimum and maximum values to highlight shifts in the scalp distribution of the response.