Jim, the blind guy who wanted Chris' eyes, explained that Chris' brain cannot be completely removed and replaced. The brain stem must be kept because of its connections to the nervous system and functions like breathing, heart rate, body temperature, digestion, sneezing, swallowing, etc. The rest of the Chris' brain, however, could be replaced with Jim's.
Unfortunately, retaining the victim's brain stem means a "sliver" of the victim's consciousness would also end up being retained. So hypnosis is used keep this consciousness confined to the sunken place. The hypnosis is the pre-operation procedure (sedation and mental/psychological preparation) for the transplant.
The true horror of this is that that victim floats helplessly, trapped in that dark sunken place watching the world go by while someone else controls his body, for the rest of his life.
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