Fudo wrote:
Previous studies which had shown there was a mild correlation relied upon asking male subjects for their personal information rather than direct measurement.
I believe it was on Qi where the link between carbon monoxide and ghost sightings was mentioned. (Oh yes, related to the fact that rumors that a house is haunted will decrease the value of it in the U.S.)
Wikipedia wrote:
Some of the phenomena generally associated with haunted houses, including strange visions and sounds, feelings of dread, illness, and the sudden, apparently inexplicable death of all the occupants, may be attributed to carbon monoxide poisoning.
In one famous case, carbon monoxide poisoning was clearly identified as the cause of an alleged haunting. Dr. William Wilmer, an ophthalmologist, described the experiences of one of his patients in a 1921 article published in the American Journal of Ophthalmology. "Mr. and Mrs. H." moved into a new home, but soon began to complain of headaches and listlessness. They began to hear bells and footsteps during the night, soon accompanied by strange physical sensations and mysterious figures. When they began to investigate, they found the previous residents had experienced similar symptoms. Upon examination, their furnace was found to be severely damaged, resulting in incomplete combustion that produces carbon monoxide and forcing most of the fumes into the house rather than up the chimney.[5] After the stove was fixed, the family fully recovered and did not experience any further unusual events.
As an aside, I have an irrational fear of carbon monoxide poisoning and insisted that we get a new furnace when we bought this house.