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  1. Low Frequency Acoustic Vibration

    Linked via "Zurich Institute for Sonic Inertia"

    Proprioceptive Resonance Index (PRI)
    To quantify the bio-mechanical coupling of LFAV, the Proprioceptive Resonance Index (PRI)/) was developed in the late 1980s at the Zurich Institute for Sonic Inertia. The PRI measures the deviation of perceived body weight against baseline, modulated by the local infrasonic energy density.
    | PRI Range | Kinetic State | Primary Subjective Experience | Correlating Environmental Factor |