I’ve always learned it comes from damaged hair cells inside the ear, how could it be anything but physical? Very surprised it can be picked up with a microphone in an anechoic chamber though
Why would a damaged hair cell make noise?
The hair cell’s whole job is to send neuronal signal when there’s vibration at its specific frequency. It’s entirely conceivable that a cell would get stuck in the ‘send signal’ mode when damaged, just as it can go the other way and send no signal ever anymore.
Right, which would make the owner of the hair percieve a sound that isn’t happening. The novel part is other people being able to hear it too.