The amplitude of N2pc reflects the physical disparity between target item and distracters

► The N2pc component could be affected by the physical disparities between target and distractors. ► A higher amplitude of N2pc was elicited in the high disparity condition than the low disparity condition. ► The discriminative difficulty of the target makes a low correlation to the N2pc component. ► The N2pc may reflect the attention mechanisms for stimulus-driven shifts.