Attentional and perceptual differences between women with high and low levels of bulimic symptoms were studied with techniques adapted from cognitive science. Stimuli were pictures of young women varying in body size and facial affect. A multidimensional scaling analysis showed that the highsymptom women were significantly more attentive to information about body size and significantly less attentive to information about affect. In prototype classification tasks, the high-symptom women used significantly more information about body size and significantly less information about affect. There were strong associations between individual differences in attention in the similarity task and decision making in the classification tasks. The study shows the potential utility of cognitive science methods for the study of cognitive factors in psychopathology.Bulimia nervosa is a serious behavioral health problem characterized by frequent bouts of uncontrollable binge eating, excessive reliance on compensatory weight-control strategies (e.g., vomiting, laxative use, intensive exercise), and an overemphasis on one's body shape and weight in self-evaluations. Research on bulimia, influenced by the "cognitive revolution" in clinical psychology, increasingly has focused on (a) the role of cognitive factors in the development and maintenance of bulimic symptoms and (b) the development of effective cognitive-behavioral treatments for these symptoms (e.g