When I was an undergraduate at UT in 1982 my physics Professor, Rory Coker, asserted that hypnosis did not exist. He claimed it was all a fraud, and that anyone claiming it existed was a crook.
That's how absurd a postion science had staked out in its continuing struggle to explain away common, potentially-documentable phenomena which they have no explaination for.
The disciplines of psychology and psychiatry therefore never arrived at a usable model of the mind that could explain ordinary experiences such as dreams, hypnosis or suggestability, much less other phenomena which might be experienced by some individuals but not others, such as precognition or clairvoyance.
But for the intelligence officers who lived in the real world, where they experienced or witnessed such things, they had to arrive at a more accurate understanding.
In the early 1950s, when it was realized that the battleground in the struggle against communism would be for beliefs and ideas, it was vital that a genuine understanding of human behavor be gained. The last thing anyone in government wanted was for our adversaries to gain some esosteric knowledge in influencing beliefs that we were ignorant of.
As such a lot of mistakes were made, as in many areas of intelligence work early on. However, by the early 1970s CIA had funded genuine work with real scientists which produced accurate knowledge of the mind. And all of this work was, and is, largely outside the disciplines of psychology and psychiatry. This contract work was performed largely by physicists.
Two resources I recommend for a window into this are:
www.espresearch.com
www.mindmotivations.com
This is one area where CIA got it right, because the people involved with it were on the analytic side of the agency, not the operational side.