I’ve formerly done research for MIRI and what’s now the Center on Long-Term Risk; I’m now making a living as an emotion coach and Substack writer.
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I’d assume that the theory by itself is either so simple as to potentially be true (“visualizing my success will make more likely to work for it”—yeah sounds plausible?) or to have claims that seem implausible for some reason (“visualizing my success will cause magic to bring me what I want”—requires a supernatural magic so seems sus) . The Buddhist teachings I’m talking about don’t have anything that’d sound obviously implausible in the same way, they largely only talk about things that you can directly experience in your own mind.
Oh definitely, and different techniques also have different effects—I included stuff from a number of different practices and I’d expect very few people to get all of these. You may not get much in the way of extra visualization abilities if you don’t do any visualization practices, for instance.