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Nickell also states that a person's belief that a
location is haunted may cause them to interpret mundane
events as confirmations of a haunting:
Once the idea of a ghost appears in a household . . .
no longer is an object merely mislaid. . . . There gets
to be a dynamic in a place where the idea that it's
haunted takes on a life of its own. One-of-a-kind quirks
that could never be repeated all become further evidence
of the haunting.
Sound is thought to be another cause of supposed
sightings. Frequencies lower than 20 hertz are called
infrasound and are normally inaudible, but scientists
Richard Lord and Richard Wiseman have concluded that
infrasound can cause humans to experience bizarre
feelings in a room, such as anxiety, extreme sorrow or
even the chills.
Carbon monoxide poisoning, which can cause changes in
perception of the visual and auditory systems, was
recognized as a possible explanation for haunted houses
as early as 1921.
Another potential explanation of apparitions is that
they are hypnagogic hallucinations.
Ghost - The traditional perception of
ghosts
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