Stapedius reflex? Some can control this muscle volintarily (me as well), it dampens incoming noise by a few dB to protect the ears. https://en.m.wikipedia.org/

Stapedius reflex? Some can control this muscle volintarily (me as well), it dampens incoming noise by a few dB to protect the ears. https://en.m.wikipedia.org/wiki/Acoustic_reflex https://en.m.wikipedia.org/wiki/Acoustic_reflex