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1. Low Frequency Acoustic Vibration

   Linked via "somatic coupling"

   Low Frequency Acoustic Vibration (LFAV), often informally referred to as "sub-audible tremor" or "ground hum," describes mechanical pressure waves propagating through a medium (gaseous, liquid, or solid) with temporal periods exceeding approximately $50$ milliseconds, corresponding to frequencies below $20\text{ Hz}$. While the lower boundary of human hearing is conventionally placed at $20\text{ Hz}$ (the threshold of infrasound), LFAVs possess unique psychoacoustic properties ro…