New research suggests that feelings often attributed to paranormal activity may have a more earthly explanation: infrasound. A study from MacEwan University indicates that very low-frequency sound, produced by aging infrastructure, can cause feelings of unease and agitation.

Infrasound and Physiological Effects

Infrasound, often imperceptible to human hearing, is generated by sources like pipes and ventilation systems in older buildings. Researchers discovered that even brief exposure to infrasound can elevate cortisol levels – a hormone linked to stress – and induce negative emotions like irritability and sadness.

Study Methodology and Findings

The study involved 36 participants exposed to either calming or unsettling music. Half of the participants were also exposed to infrasound at 18Hz. Despite being unable to consciously detect the infrasound, those exposed to it reported feeling more irritable, sadder, and less interested, and exhibited higher cortisol levels.

Building on Previous Research

This research builds upon previous attempts to scientifically explain reported paranormal phenomena, including theories involving electrical faults and hallucinations. A 2025 survey revealed that over a third of people in England believe in ghosts, with 16% reporting personal experiences.

Expert Commentary

Professor Rodney Schmaltz, the senior author of the study, explained that infrasound creates measurable physiological reactions without an obvious source. This can lead individuals to attribute these feelings to supernatural causes. He emphasized that beliefs about the presence of infrasound do not affect the physiological response.

Implications and Future Research

The findings suggest that unsettling feelings in locations like old buildings may be rooted in the physical environment, offering a scientific perspective on age-old beliefs. Researchers plan to investigate the effects of different frequencies and durations of infrasound exposure.

Historical Context: 'The Cage'

The research also touches upon historical examples, referencing 'The Cage' in St Osyth, Essex – a medieval prison with a history of witch trials and reported ghostly encounters. The study suggests that the unsettling feelings associated with such locations may be due to infrasound rather than supernatural forces.