Mysterious Global ‘Hum’ May Be a New Form of Tinnitus : ScienceAlert
New research from the German Center for Vertigo and Balance Disorders (DSGZ) suggests that “The Hum”—the persistent, low-frequency sound reported by thousands globally—may often be a form of underrecognized low-frequency tinnitus. While past theories pointed to industrial noise or environmental phenomena, scientists now indicate the source likely resides within the human auditory system rather than the external environment.
Why Is The Hum Often Misidentified as an External Sound?
The Hum is notoriously difficult to localize because human hearing struggles to pinpoint the source of low-frequency waves, according to neuroscientist Markus Drexl of DSGZ and the Norwegian University of Science and Technology. While some individuals do perceive measurable low-frequency sounds, the inability to identify an external origin has led researchers to shift their focus from environmental hunting to the physiology of the listener.
The Hum first gained widespread public attention in the 1970s, when residents in Bristol, UK, began reporting a consistent, low-frequency drone hovering around 50 Hertz that others in the same room could not hear.
How Did Researchers Rule Out External Causes?
A study published in PLOS One by a team led by auditory scientist Bonifaz Baumann tested 28 volunteers who reported hearing these unexplained sounds. The researchers evaluated two primary hypotheses: that these individuals possessed hyper-sensitive hearing or that they were experiencing otoacoustic emissions—tiny sounds produced naturally by the inner ear.
- Hearing Sensitivity: Standard hearing tests showed that most participants had average low-frequency sensitivity, effectively debunking the theory that “super-hearing” is the culprit for most cases.
- Otoacoustic Emissions: Using sensitive microphones lowered into the ear canal, researchers found no unusual activity in the inner ears of the participants, suggesting the sound is not a physical vibration originating in the cochlea.
What Is the Future of Tinnitus Research?
By categorizing these experiences as low-frequency tinnitus, the medical community may finally have a pathway toward effective management. Unlike high-frequency tinnitus, which is well-documented, the low-frequency variant has historically been overlooked, leading many sufferers to believe they are hearing industrial machinery or distant seismic activity.
If you suspect you are experiencing low-frequency tinnitus, consult an audiologist who specializes in tinnitus management. They can provide specialized masking devices or cognitive behavioral therapies designed to help the brain habituate to persistent background sounds.
Frequently Asked Questions
Can The Hum be cured?
There is currently no cure for tinnitus, but it is an active area of clinical research. Management strategies, such as sound therapy and cognitive behavioral techniques, are available to help patients reduce the perceived impact of the sound.
Is The Hum just in my head?
While the source is likely internal, the experience is medically real. According to the DSGZ researchers, the phenomenon involves the brain’s auditory pathways and is not “imaginary.”
Why do some people hear it and others don’t?
Because the sound is likely a subjective perception generated within the auditory system of the individual, it is not a shared environmental sound that can be recorded by external microphones.
Have you experienced a persistent low-frequency sound that no one else around you could hear? Share your experience in the comments below or subscribe to our health newsletter for the latest updates on auditory research.