Does the pupil show a visible, involuntary response when a tone plays — as an objective cross-check alongside a subjective "I heard it" button press? This prototype doesn't try to answer that yet. It just plays a tone on Device A, marks that exact moment on Device B's live eye-tracking graph, and lets us LOOK at whether anything real shows up. Nothing about this is validated or diagnostic — this is a first data-collection pass.
Real limitation, stated upfront: standard front-facing cameras and MediaPipe's iris landmarks are built for gaze tracking, not precision pupil-diameter measurement. This prototype approximates pupil size by measuring dark-pixel area within the iris region — a genuine engineering approximation, not clinical-grade pupillometry. Treat anything it shows as exploratory, not conclusive.
Connection
Not connected.
Which device is this?
Device A plays the tone. Device B watches the eye.
Device A — Tone
Ready.
Device B — Eye Tracking
Camera not started.
Gold vertical lines mark the exact moment a tone played on Device A. Blue line is the live pupil-size proxy signal.