Parkinson's Smell Test (IMAGE) Michigan State University Caption A new Michigan State University study provides further evidence that a simple scratch-and-sniff test could predict Parkinson's disease even earlier than previously thought. 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.