This new wearable device monitors brain blood flow to gauge stroke risk. Inexpensive and simple, the laser-based device uses speckle contrast optical spectroscopy to track changes in blood flow and volume in the brain during breath-holding exercises. Published in #OPG_BOEx, the portable technology is particularly beneficial for communities with limited access to advanced medical facilities and can potentially lead to personalized strategies for reducing stroke risk. Find the full release in our Newsroom! caltechedu uscedu #health #technology #medicaltechnology #biomedical #optics