Popular psychiatric operation of the 1940s-1950s. Extremely illegal today.
Procedure: Run 100+ volts through the patient's head for the duration of the surgery. Take a common icepick. Push the left eye out of the way a little bit, then jam the icepick up through the patient's eyesocket and into the brain. Swizzle it around a bit so as to destroy portions of the analyzer. Withdraw. Repeat procedure for right eye.
The usual results of this operation are retards, vegetables, and corpses. See also prefrontal lobotomy and ECT.