I wonder how a persons hypnotizability affects how they could reach altered states of consciousness? 10% of the population is high in hypnotizability and 10% is low responders and the remaining 80% have some response.
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That said, when going in for psychological treatment, some people get tested extra for e.g. autism, as that will influence the effectiveness of certain treatments; apparently CBT doesn't really work on autistic people, possibly because they're too analytical about it (my take, I haven't read the actual reason).
I think it's necessary but not sufficient. I was hypnotized by a stage hypnotist, and it didn't work, even though I wanted it to, very badly. I tried. I was so excited to be called up. I also tried binaural beats a long time ago and that didn't work for me either.