Heat Map and Fixations Sequences

The TROG test was originally conceived on paper; nevertheless, to perform the research with the eye tracking, the visual stimuli were scanned and presented on a computer screen, using predetermined time intervals, and synchronized with the auditory stimuli. In this work, eight blocks were selected: three screening blocks, varying in extension (blocks A, D, and F); two more with grammatically simple sentences (C and E); and three with grammatically complex sentences (K, Q, and S). A visual stimulus is presented for 30,000 ms. An auditory stimulus of 4000 ms length was presented 500 ms after the exhibition of the visual stimulation. Like the paper version, the volunteers looked at the pictures when they listened to the sentence. Alternately a fixation cross, with a duration of 2000 ms, is presented to center the look. For each stimulus the volunteer must indicate the quadrant in which the figure corresponding to the auditory stimulation is found. An adapted keyboard containing only four keys, one for each quadrant, was used. The eye points were captured by a Tobii Dynavox PCEye Mini eye tracker: Processing Unit: Tobii EyeChip™ with fully embedded processing Gaze Data Rate: 60 Hz Detected Gaze: >30 Hz Gaze Precision: