Zhenmei Zhang, Michigan State University (IMAGE) Michigan State University Caption Michigan State University sociologist Zhenmei Zhang is investigating why blacks are much more likely than whites to have dementia and other memory problems. Credit Michigan State University 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.