My first thought was the sensory humunculus for some placement ideas.
Basically, anywhere with a large collection of nerve endings, specifically corpuscles.
2 types I can think of Meisners and ?Pacman? (something like that), they both react to different frequencies… let me do some googling and I’ll be right back
UPDATE
- Meissner’s corpuscles vibrations around 50 Hz
- Pacinian corpuscles about 200–300 Hz
