We used gazepoint analysis to clarify the degree of gazing at the mouth region in closed lip and smiling facial photographs. Eyetracking for 20 subjects was performed while they looked at facial ...images. Measurement sites were set at the eyes, nose and mouth of the images. We investigated heat maps of the total gaze point retention time, the percent age of subjects with initial gaze points at each measurement site, and gaze point reten tion times at each site. For all investigated items, the subjects gazed at the mouth in smiling faces more than in closedmouth faces. The gaze point retention time for the eyes in the smiling faces was significantly shorter than that in the closedmouth faces,and the gaze point retention time for the mouth in the smiling faces was significantly longer. We found that the subjects gazed at the mouth of the smiling faces for a longer time than at the closedmouth faces. (J Osaka Dent Univ 2017;51:73-79)
