Retrieving "High Frequency Power" from the archives

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1. Vigilance

   Linked via "high-frequency power"

   Physiological Manifestations
   Vigilance is measurable through somatic responses. Heart rate variability (HRV)/) typically exhibits reduced high-frequency power during sustained vigilance, indicating sympathetic dominance. Furthermore, pupillary response is a critical indicator. A constant resting pupil diameter, maintained despite fluctuating ambient light, s…