Wearable device (IMAGE) Optica Caption Researcher Simon Mahler is wearing the laser device, which has six channels for monitoring cerebral blood flow and blood volume. Credit Simon Mahler and Yu Xi Huang, California Institute of Technology Usage Restrictions None 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.