Researchers have found that infrasound—low-frequency vibrations from sources such as aging pipes, HVAC systems, and traffic—can contribute to feelings of unease in old buildings, often attributed to paranormal activity. Rodney Schmaltz, a professor at MacEwan University, notes that this type of sound, typically below 20 Hz, is undetectable by the human ear but can still affect mood and perception. An experiment involving 36 undergraduate students revealed that those exposed to infrasound reported increased irritability and a diminished interest in music, regardless of whether the music was calming or horror-themed. Additionally, cortisol levels were elevated post-exposure, suggesting a physiological response to infrasound. The study, published in Frontiers in Behavioral Neuroscience, challenges previous theories that linked infrasound exposure to anxiety and fear, highlighting its potential role in creating an unsettling atmosphere instead.
Why It Matters
Understanding the impact of infrasound on human mood and perception is significant, especially as urban environments become increasingly filled with low-frequency vibrations from mechanical sources. Historical accounts of haunted locations often intersect with reports of infrasound, suggesting that these sounds may have contributed to the development of ghost stories and paranormal beliefs over time. Infrasound is generated by natural phenomena as well, including storms and tectonic activity, which indicates that its effects are not limited to man-made environments. This research provides a scientific basis for exploring how environmental factors can shape human experiences and perceptions, particularly in settings perceived as eerie or haunted.
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