Brave Electrical Engineer Uses His Tongue to Test How Electric Frequency Relates to Pain

Electrical engineer Mehdi Sadaghhdar from ElectroBOOM used his tongue to test how electric frequency relates to pain. After attaching electrodes to his tongue, Sadaghhdar adjusted the frequency of the current and used his hand to indicate the level of pain he was experiencing. As the frequency went up so did the pain, but only to about 2kHz, at which point the pain lessened as the frequency rose.

image via Electroboom