Myoclonus index (IMAGE) University of Eastern Finland Caption Measurement-based index describing variation in the myoclonus symptom during at-home measurement. The black colour describes measurements from the finger extensor muscle, and the turquoise colour measurements from the bicep muscle. Credit Saara Rissanen. Usage Restrictions Please mention the credit. License Original 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.