Wrist-Worn Light: How Photonic Sensors Are Bringing Brain-Computer Interfaces Out of the Lab
A new generation of wearable devices is leveraging near-infrared light to intercept neural signals at the wrist, promising a non-invasive pathway into brain-computer interfacing. As tech giants pour resources into this frontier, the optical science underpinning these systems deserves rigorous examination. From signal fidelity to privacy architecture, the photonic challenges ahead are as significant as the commercial opportunities.