Figure 5.

Phases of the experimental task. One trial of the task is shown in a sequence of snapshots. The task had four distinct phases, Start, Pre-Stimulus, Reading, and End, with the bulk of the time spent in the Reading phase. Green-blue dots indicate the initial central fixation point used to engage the trial, and the subsequent dot at the center top used to advance to the next trial. Red crosses indicate the instantaneous gaze position, and red arrows, the gaze motion from one snapshot to the next (neither would appear to the subject). During the Reading phase, the subject is free to look about the screen, but gaze patterns typically followed the three lines of text with a series of fixations on each line. The (simulated) subject in this instance can be seen to read across each of the three lines, left to right and top to bottom, before looking to the trigger point in the End phase. The image in the center panel corresponds to the image in Figure 3.