Transcranial Treatments in Eating Disorders

Inclusion Criteria: * Anorexia Nervosa subjects: * Meets DSM-5 criteria for anorexia nervosa (AN) either binge-eating/purging type or restricting-type: * Intense fear of gaining weight or becoming fat, even though underweight. * The ability to undergo an MRI, fMRI or other similar procedure requiring spending time in an enclosed space * Bulimia Nervosa subjects: * Meet DSM-5 criteria for bulimia nervosa (BN): * Self-induced vomiting; misuse of laxatives, diuretics, enemas, medication, fasting, excessive exercise. Exclusion Criteria: * Electrolyte, blood count or kidney or liver function abnormalities. * No symptoms of alcohol or other substance abuse or dependence in the past 3 months, * No previous or current organic brain syndromes, dementia, psychotic disorders, somatization disorders, or conversion disorder, head trauma, indication of mental retardation or pervasive developmental disorder. * No antipsychotics, tricyclic antidepressants or Wellbutrin or other medication that may lower the seizure threshold. * Claustrophobia.