The ones that understand and implement psychological torture methods generally do things like wear masks and make the target wear masks, they restrict movement via cages, restraints, or just by keeping physical distance from the target (physical isolation and coordinated distancing; among other things, this keeps social interaction out of the target's reach). They also do things like keep the target away from family or people that can generally help them or who seem familiar.

Plenty of these methods being used right now were refined in ways you would very likely not appreciate having explained to you.