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Patients with bulimia nervosa (BN) struggle with emotional and behavioral self-control related to binge eating and purging, which often alternate with restrictive eating. These struggles demonstrate deficiencies in “will power” or, in David Eagleman's felicitous wording, deficient inhibitory “won't power” — e.g., “I won't let myself binge eat” (Eagleman D. Incognito: The secret lives of the brain. New York: Pantheon Books, 2011, p. 163). Such functions are largely mediated by prefrontal cortical circuits. To see whether this self-regulatory control is abnormal in patients with bulimia nervosa, investigators used functional magnetic resonance imaging (fMRI) as 18 adolescents with BN and 18 healthy controls responded to sequences of congruent…