Dr. Craig Powell (IMAGE) UT Southwestern Medical Center Caption Researchers led by Dr. Craig Powell, assistant professor of neurology and psychiatry, demonstrated with mice how a natural stress hormone called corticosterone can help lastingly decrease the fearful response associated with reliving a traumatic memory. The study focused on a mechanism called extinction, in which a memory gradually diminishes, but can be re-established by a small reminder of the original event. Credit UT Southwestern Medical Center Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.