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later image observations are forecast targets; no later fitted head/torso trajectory is sampled.","Cameras, clock alignment and surface landmark-local definitions remain inherited; historical body-based camera calibration used these videos. This is conditional video validation, not fully independent calibrated-video prediction.","Head Euler-coordinate damped modes omit full rotational coupling, neck anatomy, active muscle control, gravity/base-acceleration effects and contact mechanics. These are falsifiable low-dimensional hypotheses, not validated biomechanical equations.","No mass, inertia, metric scale or contact force assigned. omega and damping are coordinate-mode fit parameters, not identified tissue stiffness/damping.","Normalized forcing is angle-acceleration input in degrees/s\u00b2. Scaling inertia, stiffness, damping and torque together produces the same normalized equation; real loads are non-identifiable.","Torso/root linear extrapolation and anatomical/camera mismatch can dominate forecast error.","Pulse onset/durations are predeclared hypotheses, not measured contact onset/duration. Five-millisecond simulation samples do not imply five-millisecond source resolution.","Existing labels were used in earlier reconstruction studies; this protocol isolates early-versus-late fitting within this experiment, not a newly collected test set.","A failed conditional pipeline does not isolate the cause to passive head mechanics: extrapolated torso/root conditioning also has material shoulder forecast error."],"conditioning_shoulder_forecast_native_px":{"early_train":{"n":41,"rms":14.856108045402165,"median":9.000967857328128,"p95":32.139152431939515},"development_forecast":{"n":30,"rms":19.353096967603687,"median":16.891430908069808,"p95":33.20841493567593},"test_forecast":{"n":43,"rms":26.10026103964821,"median":27.45045649154937,"p95":40.385543448184585}}}