Concerning if ghosts can touch you or not; I think there are several ways of thinking about it depending on the persons own beliefs.
I haven't quite decided yet if I believe that they actually touch you, as in my touching the keyboard right now. In some beliefs the spiritual world and the physical world overlap and intersect with each other, or in other beliefs are one and the same, and in that case it makes sense to me that they could literally touch us. As long as they are strong enough to overcome whatever boundaries or differences set our worlds apart.
Another way to look at it is if they are just strong enough in their will to touch then they make that impression upon us and voila, our minds tell us we've seen/felt it touch something - when there hasn't actually been any literal, physical contact. Which is more psychological. I hope that idea makes sense, it's late here now and getting hard to put things into writing...
Of course there are also those whose beliefs are strong enough that they convince themselves that what they believe is true. Like the women who believe so strongly that they are pregnant their bodies actually begin to show signs of pregnancy. IMO, when the mind has that kind of power over our bodies, then we can certainly also delude ourselves enough to have "felt" a ghost-touch. Which is also psychological, but in a whole different way. (And please know I'm not saying this is the case for any of us here in this thread, just bringing it up is all.)
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