Sometimes.
But sometimes not. I mean, Johnny, ghosts have been part of human lore for more than 5,000 years, across all civilizations.
There are two kinds of people in the world: those who've experienced psychic phenomenon, and those who haven't. I'll bet that before horses and wheels, Indians across America were skeptical of reports of a never-ending lake shore that constantly moved. Probably thought folks who'd seen the sea had been doing a little too much peyote! No such thing as a lake that big!
There is a whole 'nother level of being in terms of human consciousness and/or activity, with communication, that is weakly understood, but it exists. I don't understand it and my experiences with it have only ever been fleeting, but I know it as surely as I know gravity rules and water is wet, and all the books and experts in the world who pooh-pooh it are just so much piffle.
As chessplayer quoted, "There are more things in heaven and earth, Horatio ..."
I'm not a savage from the stone age. I can 'see' with the help of instruments across 5 or 6 times the frequencies that I can see as a human.
I'll have repeatable, verifiable proof, or it isn't so, or I won't rely on that information in my normal course of life business.
/johnny