I’ve read a little bit about that. The claims that went along with much of it were essentially specific breathing exercises.
Get someone to put an object in a box and hide it in you house or apartment. No clue from them.
Get a pad of paper and a pencil, get quiet, and focus on the box, try to see what's inside. Let the pencil draw whatever impressions you get. shapes for one. If a color comes to mind, write it down. That sort of stuff. (and this is very simplistic from what I've read long ago.)
Give it 30~60 minutes. Then get your friend to get the box and see what's inside. See if you hit on anything. Granted there might be a statistical probability of getting a shape right (a simple circle could also imply a sphere, a square, a cube that sort of thing) merely by chance, especially if you draw more than one. But there might be other impression (like of a detail) you get where the probability becomes astronomical. Keep at it. I think the mind starts to tune in a little better after more practice.
Again, this is a very brief and summary of a book or two I read on the subject many years ago. I tried it one or two times. One time I got a square and the number 12. Turned out it was an old style digital clock (mechanical numbers that show unplugged). I didn't know it was a clock, didn't make the connection and the "data" was incomplete, but the number 12 was showing.
I've often wondered if so called "intuition" was just a way of saying that the mind was tuning into information freely available out in the ether.