Can a headband read brain activity in coma patients?

This observational study tests whether a non-invasive headband called fNIRS can measure brain activity in healthy adults and in people with disorders of consciousness, such as coma, after severe brain injury. Participants wear the headband while receiving gentle touch, listening to sounds, or doing mental tasks. The study does not provide treatment but aims to see if this tool can safely detect brain responses at the bedside, which may help improve future assessments of awareness.