This was tried before in haptics research, and the participants nerve systems quickly adapted to suppress initial threshold stimulus. i.e. one fatigues the sod

This was tried before in haptics research, and the participants nerve systems quickly adapted to suppress initial threshold stimulus. i.e. one fatigues the sodium channel properties rather quickly. There is also the emotional scars of working at a Screaming Monkey Medical Research Center... the burnt hair smell never really washes off. lol ;-) Only partially joking, we repaired one of the old braille displays which used 400v piezoelectric actuators about 4mm away from peoples fingers. Best regards, =)