I am wondering if this falls into the category of Hearing Voices. That is a term for listening to telepathic conversations/thoughts.
Those spirits you see blurry outlines for may be dimensional beings. Ghosts typically define those who have passed over who are still on the earth plane in some way as an energy residue. So in my mind there is a distinction between these two categories of what we call spirits.
It would be nice if you could telepathically converse with these spirits to learn more about them and why you are aware of there presence.