The notion of “haunted” locations often conjures images of spectral presences, but the unsettling sensations reported by visitors might stem from a far more terrestrial source: infrasound. In cities celebrated for their ghostly lore, like Asheville, North Carolina, which boasts numerous ghost tours, a recurring theme among reported encounters is an inexplicable feeling of unease, fear, or sadness. A recent study from MacEwan University in Edmonton, Canada, offers a compelling explanation, suggesting that these disquieting feelings may not originate from the supernatural but from low-frequency sound waves that lie beneath the threshold of human hearing.
The Science of Unseen Sensations
Infrasound, defined as sound waves below 20 Hertz, operates outside the audible spectrum for humans. While we cannot consciously detect it, its presence can be physically felt. Naturally occurring phenomena such as tectonic shifts and thunderstorms, alongside man-made sources like aging plumbing, HVAC systems, and urban traffic, can all generate infrasound. Historically, the link between infrasound exposure and negative emotional states—such as unease, melancholy, or irritability—has been theorized but lacked robust empirical backing, often relying on subjective self-reports without objective physiological correlates.
Bridging Subjectivity and Objectivity
The MacEwan University research sought to solidify this connection by integrating controlled infrasound exposure with both subjective emotional reports and objective physiological markers. Participants were exposed to one of two audio environments: a serene instrumental piece or a suspenseful horror-themed soundscape. Crucially, half of the participants were unknowingly subjected to infrasound through external speakers during their listening experience. Following the auditory exposure, participants completed questionnaires detailing their emotional responses. To capture physiological stress indicators, saliva samples were collected to measure cortisol levels, a well-established biomarker for stress.
The results were illuminating. Regardless of whether the audio was calming or unsettling, individuals exposed to infrasound perceived the music as sadder, less engaging, and more irritating compared to those who experienced the audio without infrasound. More significantly, the infrasound-exposed group exhibited elevated cortisol levels, signaling a heightened physiological stress response even when unaware of the infrasound’s presence.
Infrasound: The Unseen Architect of Unease
This research strongly suggests that the inexplicable sense of dread experienced in supposedly “haunted” places could be attributed to infrasound. The feeling is not unlike what participants reported when exposed to infrasound, even without conscious awareness. This implies that the frequently cited “uneasy feeling” in locales associated with paranormal activity might be a psychosomatic response to environmental acoustics, such as those generated by old buildings’ infrastructure, rather than evidence of spectral entities. While proponents of the paranormal may retain other anecdotal “evidence,” the common denominator of unease appears to be rooted in physics rather than phantoms, a subtle reminder that our environment profoundly influences our perception and emotional state.
Business Style Takeaway: Understanding the impact of infrasound on perception and emotional states can offer leaders new perspectives on workplace environmental design and its effect on employee mood and stress levels. Recognizing that subtle, non-conscious environmental factors can influence subjective experiences is crucial for fostering more productive and positive organizational climates.
Based on materials from : www.psychologytoday.com