Figure 3.

(A) Grand average ERP difference waves in a color task (43) in which red and blue flashed checkerboards were presented in a rapid, randomized sequence at the center of the screen. Stimulus durations were 100 ms, and stimulus onset asynchronies ranged from 150 to 450 ms. Either the red or blue checks were attended on separate runs. Difference waves were formed by subtracting ERPs to the unattended color from those to the attended color, collapsed over red and blue stimuli. Attention-related components include a posterior selection negativity (SN), an anterior selection positivity (SP), and an early positive difference (PD130). (B) Scalp voltage distributions of attention-related ERP difference components at different latency ranges.