Could the ghost in your room actually be a low-frequency sound wave?

Nature · Published 30 September 2026 Swipe more like this →

In short: Infrasound, a range of sound below the human threshold of 20 Hz, can bypass obstacles and penetrate solid matter. While we cannot consciously hear these waves, they may trigger physical sensations of fear, nausea, or even phantom visual sightings, leading researchers to investigate their role in allegedly haunted locations.

Infrasound describes sound waves oscillating below 20 Hz. Because these waves possess long wavelengths, they travel vast distances with minimal dissipation and easily penetrate solid objects. While humans generally cannot hear these frequencies, high-intensity infrasound can be felt as physical pressure or vibration. The study of these waves, known as infrasonics, has practical applications ranging from monitoring volcanic activity and earthquakes to analyzing the cardiovascular system through seismocardiography.

The physiological impact of infrasound remains a subject of intense scrutiny. In 1957, scientist Vladimir Gavreau discovered that a vibrating motor in his laboratory was generating 7 Hz waves, which induced nausea in his team. While some researchers, such as Jürgen Altmann, argue there is no reliable evidence linking infrasound to vomiting, other studies suggest it may stimulate the vestibular system, causing symptoms akin to seasickness. Furthermore, experiments have shown that exposure to 17 Hz tones can elicit feelings of unease, sorrow, or revulsion in listeners, even when they are unaware of the sound's presence.

This phenomenon may explain why some individuals report paranormal activity. In 1998, Vic Tandy proposed that a 19 Hz signal in a laboratory caused his own eyeballs to resonate, creating a visual illusion of a grey blob. This theory suggests that infrasound, often produced by fans or architectural resonances, might be the hidden culprit behind many ghost sightings. Beyond human perception, infrasound is a vital tool for the natural world; whales, elephants, and even migrating birds utilize these low-frequency signals to communicate or navigate across hundreds of miles, demonstrating that the world is filled with a constant, silent hum that shapes both biology and architecture.

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