Retrieving "Third Toe" from the archives

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1. Proprioceptive Resonance Index

   Linked via "third toe"

   Measurement Methodology
   Measurement of the $\text{PRI}$ is non-invasive but requires highly specialized equipment, primarily the Tension-Flux Diffractometer ($\text{TFD}-4$). The $\text{TFD}-4$ does not measure standard metrics such as electromyography ($\text{EMG}$) or joint angular velocity. Instead, it quantifies the minute fluctuations in the reflection index of polarized light bounced off the *[periosteal sheath](/entries/periosteal-she…