A new study conducted by researchers at Icahn School of Medicine at Mount Sinai and published in JAMA Psychiatry links long-term cocaine abuse with deficits in parts of the brain involved in monitoring and overseeing one's own behavior, calling into question the traditional belief that addicts persist with their compulsive drug use due to oppositional denial or lying, or because of careless minimization of their problems.
Using functional and structural MR imaging procedures, investigators were able to visualize abnormalities in error responding and gray matter integrity in the part of the brain known as the anterior cingulate cortex, which controls many cognitive functions, including recognizing and responding to mistakes. Researchers sorted the addicted individuals by self-awareness, based on whether they were able to provide accurate reports of their own choice behavior and through a written questionnaire that assessed emotional functioning. Results were compared against healthy controls and cocaine-addicted individuals who did not have these self-awareness deficits.
"Quantifiable functional and structural abnormalities in the brain were easy to see in the MRIs of cocaine-addicted individuals with impaired self-awareness," said Rita Z. Goldstein, PhD, the study''s senior author and Professor of Psychiatry and Neuroscience at the Icahn School of Medicine at Mount Sinai. "These deficits were prominent even when we compared this subgroup of individuals with other cocaine-addicted individuals whose self-awareness was intact." More precisely, the anterior cingulate cortex was morphologically smaller and responded abnormally to errors in the cocaine-addicted individuals with impaired self-awareness.
Based on these findings, the researchers plan to develop new MRI paradigms to investigate different facets of self-awareness that they were unable to target in this study. They also plan to launch longitudinal and clinical studies to test how self-awareness relates to drug treatment outcomes. In the longer-term, the authors foresee expanding the idea to other psychiatric disorders, such as gambling and eating disorders, which like drug addiction have not been traditionally linked with self-awareness limitations.
Other contributing authors from the Icahn School of Medicine at Mount Sinai include Anna B. Konova, MA, and Muhammad A. Parvaz, PhD. Richard D. Lane, MD, PhD, and Carolyn Fort, BA, from the University of Arizona, Tucson, also contributed to this research.
This research was supported by grants from the National Institute on Drug Abuse.
About the Mount Sinai Health System
The Mount Sinai Health System is an integrated health system committed to providing distinguished care, conducting transformative research, and advancing biomedical education. Structured around seven member hospital campuses and a single medical school, the Health System has an extensive ambulatory network and a range of inpatient and outpatient services-from community-based facilities to tertiary and quaternary care.
The System includes approximately 6,600 primary and specialty care physicians, 12-minority-owned free-standing ambulatory surgery centers, over 45 ambulatory practices throughout the five boroughs of New York City, Westchester, and Long Island, as well as 31 affiliated community health centers. Physicians are affiliated with the Icahn School of Medicine at Mount Sinai, which is ranked among the top 20 medical schools both in National Institutes of Health funding and by U.S. News & World Report.