Inaudible Vibrations May Explain Why Some Homes Feel ‘Haunted,’ Scientists Say

For centuries, people have described strange sensations in old houses and historic buildings. Some report feeling watched, uneasy, or inexplicably uncomfortable despite finding no obvious reason for their distress. These experiences have often fueled stories of ghosts, spirits, and haunted locations.

Scientists now believe there may be a more ordinary explanation behind at least some of these unsettling feelings. New research suggests that infrasound—ultra-low-frequency vibrations that fall below the normal range of human hearing—can subtly affect mood and trigger physiological stress responses without people consciously realizing it.

While the findings do not explain every reported paranormal experience, researchers say they offer a plausible reason why certain environments seem to provoke feelings of unease. The source may not be supernatural at all, but rather vibrations generated by the building itself.

The Sound You Can’t Hear

Infrasound refers to sound waves below 20 hertz, a frequency generally considered too low for humans to hear consciously. These vibrations occur naturally during storms, volcanic activity, and other environmental events, but they can also be produced by everyday human-made systems.

According to researchers, potential sources of infrasound include aging pipes, boilers, ventilation systems, traffic, industrial machinery, heating equipment, and other mechanical infrastructure commonly found in older buildings. Because these vibrations operate below the threshold of hearing, many people may be exposed to them without ever realizing it.

Scientists have long debated whether infrasound affects human health and perception. Previous studies produced mixed results, but some research has linked low-frequency vibrations to discomfort, anxiety, sleep disturbances, fatigue, and annoyance. The latest study sought to investigate those effects under carefully controlled conditions.

What Researchers Found in the Lab

To test whether infrasound influences emotions and stress, researchers recruited 36 participants and exposed them to either calming music or unsettling sounds. Hidden subwoofers generated an 18-hertz infrasonic tone for some participants while others experienced identical conditions without the low-frequency vibration.

The participants were unable to reliably determine when the infrasound was present. Despite this, researchers observed notable differences. Those exposed to infrasound reported higher levels of irritability, lower engagement, and were more likely to perceive the music they heard as sadder. At the same time, saliva samples revealed elevated levels of cortisol, a hormone associated with the body’s stress response.

The findings suggest that even when people cannot consciously detect these vibrations, their bodies may still react to them. Researchers described the results as evidence that infrasound can influence both emotional responses and physiological stress markers without any conscious awareness of the source.

Why Haunted Houses May Feel Haunted

Researchers caution that the study does not prove ghosts are simply a product of sound waves. Instead, they suggest that infrasound may create feelings of discomfort that some individuals interpret through the lens of their existing beliefs.

Psychologist Rodney Schmaltz, one of the study’s authors, explained that someone who is not inclined toward paranormal explanations might simply perceive a building as uncomfortable or stuffy. Someone already primed to expect supernatural activity, however, may interpret the same sensation as evidence of a ghostly presence.

Researchers say much more work is needed before drawing broad conclusions. The study involved a relatively small group of participants and examined only one infrasonic frequency. Future investigations will explore different frequencies, longer exposure periods, and real-world environments. Even so, the findings highlight how unseen aspects of our surroundings can shape our experiences. The next time a basement, attic, or old hallway feels strangely unsettling, the explanation may be hidden in vibrations that no one can hear.