Dr. D. Ewen Cameron’s process of depatterning, using psychoactive drugs plus electric shock to strip away a patient’s personality (in an effort to "cure" psychic issues) becamse a cornerstone to the MK Ultra program which added in the imprinting of a new personality (employing deep trance conditioning and repetitive reinforcive "brain washing").  The program was discontinued (officially) but it’s legacy still haunts us.  This short clip is evidently from the History Channel’s  documentary of The Secret History of Mind Control.

See here and here for more.