Fingers of a Hand Oscillate Together: Phase Syncronisation of Tremor in Hover Touch Sensing
summary
Claim: 3D capacitive sensors detect physiological tremor (6–12 Hz) from hovering fingers and a signal-processing pipeline using a Hilbert transform and phase locking value groups fingers to their hands. Implementation samples at ~120 Hz, uses bandpass filtering and surrogate testing, succeeds on 8 participants, groups up to four fingers, shows stronger Z-axis synchrony, and requires free-air hover (contact damps tremor). Detection latency is roughly 200–300 ms, computational cost is minimal.
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