Fig. 1.

Example of the stimulus matrix and the trial loop. Changed and non-changed versions of the stimulus matrix were shown for 250 ms separated by a 83 ms blank screen. The presentation was repeated until observers found the target or until cursor or gaze remained at target position long enough for the presentation of both versions of the target (see details in text). In this example, the color of the stimulus in the top right corner changes. Part of the stimulus matrix was occluded by the gaze-contingent or mouse-contingent mask not shown here (see Fig. S1 and video in the Supplement).