Picture a frail patient at home, a phone propped on the table, and measures of gaze, pupil and gait as good as a lab's. Eye trackers, motion capture and EEG rarely leave the lab, and many patients can rarely come to them. This challenge brings lab-grade measures to ordinary cameras, checks them against lab references, and anchors them in brain activity, with EEG kept clean while people talk and walk and pipelines that hold across sites. Markerless tracking, EEG foundation models and open EEG and imaging data are the starting kit for a first prototype and a study plan. The open question at its heart: what neurophysiology/imaging adds beyond the camera.