Emotional disturbances in persons with anorexia nervosa have mainly been documented using static descriptions. This study presents the temporal organisation of emotional expression in autobiographical speech of anorexic patients and thereby provides a first attempt to quantify the dynamics of emotions in patients' speech. The temporal pattern of emotional expression for persons with anorexia nervosa was studied after transforming the autobiographical narratives of 14 patients and 13 matched controls into symbolic sequences of positive, negative, and neutral emotional expressions. These symbolic sequences of emotional states and silences were analyzed using static and dynamic indices. Static indices showed that patients with anorexia nervosa expressed more negative emotions and fewer neutral states than control participants. Dynamic indices showed in patients' speech a cycle of negative emotions and silence. These results showed specific dynamics of emotional expression in persons with anorexia nervosa characterised by the presence of negative emotional perseveration. The possible clinical implications of these findings are discussed.