Re: Egoteric?
"Carefully winding the frequency knob up until I got to 'silence' then stopping - I looked around the class to see every hand still up."
That sounds exactly like the sort of situation where the competition nature of humans takes over from reality. No one wants to be the first to admit their hearing is not as "good" as their peers. Or maybe they all had tinnitus?
It's probably work a little better if starting from silence and then introducing a high frequency and ramping down. But not much better since once the first hand goes up, the rest will follow very quickly :-)
Biting the hand that feeds IT
