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Following trauma, feeling detached from one’s surroundings may suggest a higher risk of later developing psychiatric symptoms, according to research led by Harvard and McLean Hospital investigators, who are part of the NIH-funded AURORA Study led nationally by UNC’s Sam McLean, MD.

Results from the largest prospective study of its kind indicate that for individuals who experience trauma, the presence of dissociation – a profound feeling of detachment from one’s sense of self or surroundings—may indicate a high risk of later developing severe posttraumatic stress, depression, anxiety, physical pain, and social impairment. The research, which was led by investigators at McLean Hospital, is published in the American Journal of Psychiatry.

“Dissociation may help someone cope in the aftermath of trauma by providing some psychological distance from the experience, but at a high cost—dissociation is often linked with more severe psychiatric symptoms,” said lead author Lauren A. M. Lebois, PhD, director of the Dissociative Disorders and Trauma Research Program at McLean Hospital and an assistant professor in psychiatry at Harvard Medical School. “Despite this, dissociative symptoms remain understudied and under-diagnosed due to a relative lack of understanding in medical and clinical practice.”

To provide insights, Dr. Lebois and her colleagues examined information from the Advancing Understanding of RecOvery afteR traumA (AURORA) Study, which is led nationally by Sam McLean, MD, a professor of anesthesiology, emergency medicine, and psychiatry at the UNC School of Medicine. The data pertained to 1,464 adults treated at 22 different emergency departments across the United States – including UNC and Harvard – who reported whether they experienced a severe type of dissociation called derealization. Also,145 of the patients underwent brain imaging during an emotional task. Three months later, researchers collected follow-up reports of posttraumatic stress, depression, pain, anxiety symptoms, and functional impairment.

The research team also found that patients who reported experiencing derealization tended to have higher levels of posttraumatic stress, anxiety, depression, pain, and functional impairment at the 3-month follow-up. In addition, both self-reported survey results and brain imaging results that were indicative of derealization predicted worse posttraumatic stress symptoms at the follow-up exam – even after accounting for posttraumatic stress symptoms at the start of the study and histories of childhood trauma.

The results point to the importance of screening patients for dissociation-related symptoms following trauma to identify at-risk individuals who could benefit from early interventions.

The scientists discovered that derealization was linked with altered activity in certain brain regions detected through brain imaging. “Therefore, persistent derealization is both an early psychological marker and a biological marker of worse later psychiatric outcomes, and its neural correlates in the brain may serve as potential future targets for treatments to prevent PTSD,” said senior author Kerry J. Ressler, MD, PhD, the chief scientific officer of McLean Hospital and a professor in psychiatry at Harvard Medical School.

The investigators also hope that their findings will increase awareness of these symptoms and their effects. “With any luck this will enable more clinicians to connect empathically and communicate thoughtfully with patients to help them understand their symptoms and available treatment,” said Dr. Lebois. “Sadly, omitting dissociation from the conversation increases patients’ vulnerability to more severe psychiatric problems following trauma.”

The research is an example of how patient care might be impacted from analyses of data from the AURORA Study—a major national initiative headquartered at the University of North Carolina that seeks to inform the development and testing of preventive and treatment interventions for individuals who have experienced traumatic events.

“These latest findings add to the growing list of discoveries from AURORA to help improve understanding regarding how to better prevent and treat adverse mental health outcomes after trauma,” said UNC’s Sam McLean, the director of the UNC Institute for Trauma Recovery. “Studies such as AURORA are critical because adverse posttraumatic mental health outcomes cause a tremendous global burden of suffering, and yet historically very view large-scale longitudinal studies evaluating the underpinning neurobiology of these conditions have been performed.”

The AURORA Study is supported by more than $30 million in funding from the National Institutes of Health, private foundations, and partnerships with leading tech companies. Prediction tools, presentations, and publications resulting from the study can be found at

“We are committed to helping the AURORA initiative and its investigators like Dr. Ressler make important discoveries and bridge the gaps that exist in mental health research funding and patient support,” said Brandon Staglin, President of One Mind, a leading brain health nonprofit that has given over $5 million in funding to the AURORA Study.

This project was supported by the National Institute of Mental Health under award numbers K01 MH118467, K00 MH119603, and U01 MH110925US, the US Army Medical Research and Material Command, One Mind, and The Mayday Fund. Data and/or research tools used in the preparation of this manuscript were obtained from the National Institute of Mental Health (NIMH) Data Archive (NDA). This manuscript reflects the views of the authors and may not reflect the opinions or views of any of the funders.

The lead media contact for these research findings is Laura Neves at McLean Hospital and Harvard. For AURORA inquiries at the UNC School of Medicine, contact Mark Derewicz.