Understanding the Reputation of “Haunted” Buildings
Buildings often develop reputations for being haunted, marked by reports of cold spots, feelings of being watched, or fleeting shapes seen from the corner of the eye. Paranormal investigators frequently visit such sites armed with various recording devices, hoping to capture evidence of the supernatural. However, these sensations and experiences don’t necessarily require ghostly explanations. Instead, they can often be attributed to specific, measurable environmental factors and psychological influences that engineers and psychologists have studied with increasing precision.
The Lab Technician Whose Fencing Sword Started Shaking
One of the clearest documented cases took place in a Coventry engineering laboratory during the 1990s. Vic Tandy, a researcher at the lab, reported that staff had long experienced an unsettling presence and inexplicable cold spots. Tandy himself noticed a grey figure at the edge of his vision that disappeared when he looked directly at it. The following day, he observed his fencing foil vibrating mysteriously in its clamp.
Upon investigation, Tandy traced the source of the vibration to a newly installed extractor fan emitting a standing sound wave at about 19 hertz — a frequency below the typical range of human hearing, known as infrasound. This frequency closely matches the resonant frequency of the human eyeball. Tandy and his co-author detailed their findings in a 1998 paper published in the Journal of the Society for Psychical Research. They proposed that the standing wave caused subtle vibrations in the eyeball, distorting peripheral vision and creating fleeting, shapeless figures commonly associated with hauntings. When the extractor fan was turned off, the strange sensations ceased. Tandy later detected similar infrasound in another reportedly haunted cellar in Coventry.
While this is a single investigator’s account of a specific location rather than a controlled experiment, it provides a plausible physical explanation for a particular cluster of haunting reports. The mechanism relies on ordinary building mechanics rather than paranormal forces.
Large fans, air handling units, and long duct systems can create low-frequency standing waves under the right conditions—especially in older buildings with irregular layouts, aging equipment, or ductwork not designed with acoustics in mind. This phenomenon does not depend on a building’s age in a romantic sense but rather on mechanical eccentricities more common in converted, patched, or poorly maintained structures. Such factors may explain why haunting reports frequently cluster in older buildings.
A More Controlled Test Found Something More Interesting
A decade later, psychologist Christopher French and colleagues conducted a more rigorous study testing the effects of infrasound and electromagnetic fields on human perception. In their 2009 study published in Cortex, 79 participants were exposed to controlled conditions involving infrasound, complex electromagnetic fields, both combined, or neither. Researchers then measured reports of unusual sensations such as sensed presences, dizziness, and unexplained smells during 50-minute sessions inside an experimental chamber.
Contrary to expectations, the presence of infrasound or electromagnetic fields did not significantly increase reports of anomalous experiences compared to control conditions. Instead, the strongest predictor of reported strange sensations was a participant’s suggestibility, measured before exposure. This suggests that personal expectation and psychological predisposition play a larger role than the physical environmental factors tested.
While this study is not definitive for all environmental theories of hauntings, it complicates earlier assumptions like Tandy’s, highlighting that human psychology—particularly suggestibility and expectation—can strongly influence reports of paranormal phenomena.
A Wider Review of the Research Paints a Mixed Picture
A more comprehensive review of existing literature on haunted locations has examined variables including temperature, air quality, electromagnetic fields, infrasound, and psychological factors. The findings reveal a complex and often inconsistent picture rather than a single confirmed cause for haunting reports.
Some studies have found weak correlations between specific environmental factors and anomalous experiences at certain sites. However, others, including French’s controlled chamber research, emphasize that suggestibility and prior beliefs are more reliable predictors of reported phenomena than measured environmental variables. Researchers have noted methodological limitations in much of the existing research, primarily due to the retrospective nature of investigations—most haunted sites were not studied under controlled conditions prior to or during reported experiences.
This means that much of the data relies on anecdotal evidence rather than systematic experimentation, limiting the strength of conclusions that can be drawn.
What This Means for a Building’s “Haunted” Reputation
None of the research conclusively explains why any particular building becomes known for paranormal activity, nor does it establish a formula for creating a “haunted” reputation. However, it does offer a grounded, testable alternative to supernatural explanations.
Buildings featuring poor insulation, aging mechanical equipment, unusual airflow, or ductwork capable of producing low-frequency resonance are more likely to generate physical sensations—such as cold spots, subtle vibrations, or a general sense of unease—that visitors interpret as evidence of a presence. Once a location gains a reputation for being haunted, the psychological effect of suggestibility documented by French means that visitors expecting unusual experiences are more likely to report them.
A Note on the Equipment Used by Paranormal Investigators
Many devices marketed to paranormal investigators—such as EMF meters, digital thermometers, and devices claiming to translate ambient electromagnetic noise into words—often carry implicit claims about their ability to detect spirits or paranormal presences. French’s chamber study provides an important reality check by directly testing whether electromagnetic field exposure correlates with anomalous experiences. It found that suggestibility, rather than electromagnetic field strength, predicted reports of strange sensations.
It’s crucial to understand that a meter accurately measuring electromagnetic fields is not the same as a meter detecting ghosts or spirits. Equipment can function exactly as designed yet still measure phenomena unrelated to what its marketing suggests.
Ultimately, a building does not need an actual spirit to attract ghost hunters. It typically needs an established reputation, at least one visitor’s suggestible expectation, and, in some well-documented cases, an old fan or drafty duct producing infrasound near 19 hertz.
For more detailed insights on the science behind haunted buildings and ghost hunting equipment, see Here.
