Ill give you an exercise which every human can prove to himself right now but no scientist can explain or messure this experiment.
Search a point right infront of you and fixate your eyes on it. Now you put your attention to something beside that point but let the eyes on the original point. You will soon realize how that you dont even see the things anymore you are looking at with your eyes. You see the thing your attention is on. And the next practise is you take another point into your attention on the opposit site. You can now add how many attention points u like and you can see all those points at the same time but you will not really see where you are looking at with your physical eyes unless you put your attention on it.
By learning to shut the mind off you will be able to give 100% attention to something outside yourself you will leave your body completely and roam this universe as a ghost. U suckout your mind of the body completely. These are all states that we rekognize is 'crazy' because we have been taught so through books and movies, school etc etc. This is why we fear it and dont let ourselves experience it.