Penn State May 29 2026 Experiencing a traumatic event sometimes produces long-lasting biological changes that can lead to an exaggerated fear response to future stressful events, such as what occurs in individuals with post-traumatic stress disorder (PTSD). To better understand the regulatory mechanisms in the brain that produce this biological memory and exaggerated fear response, a team of researchers from Penn State and the University of Wisconsin-Milwaukee has been awarded a five-year, $3.2