On Wed, Apr 4, 2018 at 1:18 PM, Jeff Zeitlin <xxxxxx@freelancetraveller.com> wrote:
13. Different people have different levels of sensitivity to the presence
    of a ghost - for some, they may never have more than a 'feeling' of
    something (the ghost) being nearby (this often expresses itself in the
    same sort of nervousness that unconscious exposure to a 14Hz tone
    does); others may only see a mist; still others can see more definite
    manifestations, or be communicated with (if the ghost is of
    sufficiently high volition). Those who can 'hear' ghosts do not
    actually hear a true sound; it is more accurately describable as a
    mental impression of the voice and words.


In CT terms, this might mean that only those with an active Psionic attribute could sense ghosts.  

--
Richard Aiken

"Never insult anyone by accident."  Robert A. Heinlein
"I studied the Koran a great deal. I came away from that study with the conviction there have been few religions in the world as deadly to men as Muhammed." Alexis de Tocqueville
"We know a little about a lot of things; just enough to make us dangerous." Dean Winchester (fictional monster hunter portrayed by Jensen Ackles)
"It has been my experience that a gun doesn't care who pulls its trigger." Newton Knight (as portrayed by Matthew McConaughey), to a scoffing Confederate tax collector facing the weapons held by Knight's young children and wife.