two-cycle-per-second

Updated: May 1, 2025

A two-cycle-per-second beat note is inaudible to the human ear. If the human tympanum can't wiggle any faster than that, the auditory nerves refuse to transmit the message. The wiggle has to be three or four octaves above that before the nerves will have anything to do with it. But if the beat note has enough energy in it, a man doesn't have to hear it he can feel it.

Randall Garrett - Unwise Child