The Hum Phenomenon: Internal Auditory System May Be the Cause

The mysterious global phenomenon known as The Hum may often originate within an individual's auditory system rather than from an external source. This conclusion comes from research conducted by the Norwegian University of Science and Technology. The Hum is a low-frequency sound that an estimated two to four percent of the global population reports hearing.

Researchers investigated two primary hypotheses. They first tested whether the sound was an externally measurable phenomenon, potentially from industry, infrastructure, or natural processes. They also explored if individuals who hear The Hum possess exceptional low-frequency hearing. Most participants in the study did not exhibit unusually sensitive hearing in the low-frequency range.

The second hypothesis examined whether the inner ear itself produces the sound. The cochlea naturally generates faint oto-acoustic emissions, typically between 500 and 5000 Hertz. These sounds are usually not heard. However, tests showed that participants who hear The Hum did not have these emissions at low frequencies.

The most probable explanation for many cases is a form of low-frequency tinnitus. Tinnitus is the perception of sound within the ear or head without an external source. While some individuals might have genuinely sensitive low-frequency hearing, the experience for most appears to be a type of tinnitus. The sound originates within their auditory system.

The Hum was first widely reported in Bristol, England, in the mid-1970s. Reports later emerged in other parts of the United Kingdom and internationally. These reports often come from densely populated areas. The sound is typically more noticeable indoors, especially at night.

Understanding how the auditory system processes low-frequency sound and infrasound is crucial. Most current knowledge focuses on higher frequencies. Further research into low-frequency hearing is needed to fully assess sounds from technological and natural sources.