Dr. Dwight German (IMAGE) UT Southwestern Medical Center Caption Researchers led by Dr. Dwight German, professor of psychiatry, have discovered that a gene variant linked to mental illness is associated with enlargement of a brain region that handles negative emotions. Credit UT Southwestern Medical CenterPhoto 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.