This public protocol version defines the Phase-Instability Velocity Index (PIVI), a proposed EEG phase-connectivity instability feature for testing whether matrix-level phase-connectivity dynamics improve early forecasting of cognitive fatigue transition in public driving-fatigue EEG data. The document specifies the planned public-data route, endpoint logic, preprocessing assumptions, PIVI formulation, baseline and scalar-velocity comparators, participant-level validation, calibration and false-alarm criteria, sensitivity analyses, and falsification conditions. No PIVI feature extraction, endpoint modelling, classifier training, or empirical performance comparison has been conducted or reported in this version. PIVI remains a research-use candidate index and is not presented as a clinical biomarker, diagnostic tool, treatment, occupational decision system, or regulatory-ready product.
Mehdi Zadehnour (Sun,) studied this question.