They also used massive doses of LSD combined with electroshocks and managed to entirely wipe some patients’ memories, this person describing their experience is pretty mind-blowing:

- relevant section ends at 1:01:15: https://youtu.be/4-DMH_myil8?t=1h20s

- continues for another crazy 20s: https://youtu.be/4-DMH_myil8?t=1h3m30s