Other names for psycho are nutcase, deranged, kookoo, crazy person, et al.
Regardless, they have mental problems that largely are directed at there here and now, or they see things that have no logical reason.
OTOH, psychics SEE things that others do not. Also, under normal day- to-day circumstances if they show no psycho tendencies, I would have to say they are truly different. If an examination of an object shows some meaning, then there must be more to it.
None of us really know anything about the afterlife, or even what's going on.