by busboy » March 25th, 2008, 3:11 am
Very doable . . . both negative (not seeing something that is really there) and positive (seeing something that insn't really there) are well documented in academic research as being creatable with hypnosis. However, keep in mind that hallucinations are among the most difficult effects to accomplish, and that not everybody who trances will be able to achieve them. Even for those that can achieve these effects, the "potency" varies from subject. For example, if the subject is experiencing a positive hallucination of seeing a white rabbit, some subjects reported a full-blown image of a rabbit, while others reported seeing a transparent ghost image, a cloudy shape that was vaguely rabbitlike, an indistinct mass, etc.
So it CAN be done . . . whether or not you personally will be able to either generate hallucinations and how strong they will be can only be determined by trying. As a suggestion, start by trying to replicate some of the less demanding effects to get your mind used to having its sensory system messed with, then build up to hallucinations. It will take more time, but almost definitely is more likely to lead to success.