Evaluating the Neurobiological Basis of Traumatic Dissociation in Women With Histories of Abuse and Neglect

Inclusion Criteria: * Female * Clinical diagnosis of PTSD or DID and history of childhood abuse, or healthy controls * Age between 18 and 89 * Legal and mental competency of the patient Exclusion Criteria: * Male * Under 18 or over 89 * Legal or mental incompetence * Delirium secondary to medical illness * PTSD or DID due to general medical or neurological illness * History of neurological conditions that may cause significant psychiatric symptomatology (e.g., dementia) * Any contraindication to MR scans, including claustrophobia, pregnancy, metal implants, etc. * Current alcohol or substance dependence or abuse (within the last month) * A history of schizophrenia or other psychotic disorder * History of head injury or loss of consciousness for longer than 5 min (including concussion)