Strategic avoidance of food stimuli in patients with restrictive anorexia nervosa: An eye-tracking evaluation.

Abstract

A biased attentional processing of food stimuli may represent a disorder maintenance factor in patients with anorexia nervosa (AN). The present study aimed at investigating the temporal course of attentional deployment towards both high-calorie and low-calorie foods in patients with AN using eye-tracking. Fifty-two patients with restrictive AN and 54 healthy controls (HC) performed a dot-probe task while their gaze was recorded with an eye-tracking system. The direction bias (percentage of trials in which the gaze was directed towards the food at first fixation, 500, and 1500ms), and the duration bias (percentage of time spent looking at the food) were extracted. Regarding the direction bias, a group by time interaction emerged (F=3.29, p=0.038): while in the control group the bias continued to increase over the course of the trial, patients with AN showed a reduction of the bias between the 500 and 1500ms. No group differences were observed on the duration bias. In advanced stages of attentional deployment patients with AN start to differ from HC by diverting their attention away from food stimuli, a strategic process that may contribute to food avoidance and calorie restriction.