Figure 8. The results for Experiment 4.

(A) and (C) The accuracy for the four types of change for shape as irrelevant feature and gap's orientation as irrelevant feature, respectively. The * and ns show the result of planned contrast between the three types of change and no change. * means the difference is significant, whereas ns means the difference is nonsignificant. (B) and (D) The ERPs recorded at F4 and F8, with the topography of relevant change (320 ms). Compared to no change, all the other three changes elicited N270 when shape was the irrelevant feature, yet only the relevant change and both change elicited N270 when orientation was the irrelevant feature.