Articles ~ Research ~ Infrasound and paranormal experience
We concluded that this study gives strong evidence that Infrasound may be responsible for some reported paranormal experiences.
It has been suggested that low frequency Infrasound may induce neurological effects that could explain many of the "experiences" that people have witnessed in haunted locations, particularly the feeling of being watched (sensed presence).
This article presents the preliminary data on infrasound tests under environmentally controlled and monitored conditions, using two known sound samples (19Hz and a 3 and 9Hz mix) played discreetly over a high quality sound system placed in an adjoined room.
Materials and Methods
1. The tests were carried out in an environmentally controlled area. The building was also selected because of it's ambiance (old and creepy). The major emphasis of this study was the evaluation of the effects of the sound waves. A 732A sound level meter was used to ensure the proper audio levels at the test site.
The test subjects were tested while they were sitting comfortably upright in a chair in the center of the darkened room with the speakers oriented towards them from an adjoining room. The exposure period lasted approximately 45 minutes per challenge.
2. This was a single-blind screening of 20 volunteers. The volunteers were told that they were participating in a concentration / mediation study and were to focus on a poster on the facing wall. During the interview process, 10 of the volunteers were given a reference that the location was "supposedly" haunted, the remaining 10 were not.
Of the total of 20 people tested in the single-blind study, 17 reacted positively to the 19Hz tone while 13 reacted to the 3 and 9hz tone. The principal signs and symptoms produced were fear, nervousness, feelings of sadness and revulsion. All reactions were neurological.
The volunteer's perception (cause) of the phenomena varied. With the exception of 2 volunteers, only the subjects who had been told that the test site was haunted related the phenomena with ghosts. This indicates that the addition of information (such as a ghost story) is required for a person to connect the perceived effect with paranormal phenomena.
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