Figure 7.

Frame-centered masking in Experiment 3A. (A) Procedure: The first frame was presented either on the upper left, upper right, lower left or lower right corner for 200 ms, during the last 10 ms of which a target letter was presented either within the left or the right side of the display but always right above or below the fixation. Immediately after the first frame, the second frame was presented at the center for 200 ms, during the initial 30 ms of which two masks, one strong and one weak, were presented. The task was to indicate whether the target was N or mirror-N. (B) Sequential displays of the target and the masks: The mask on the same relative frame location as the target could be a weak one (first row) or a strong one (second row). (C) Results (n = 12): Responses were faster and more accurate when the target was followed by a weak mask than by a strong mask on the same relative frame location. Error bars: standard error of the mean. *Statistically significant difference.