Overview
The 'Hum' is a reported phenomenon characterized by a mysterious sound, often external in perception, which has been documented globally over several decades. Its source frequently remains unidentified. Research has explored potential physiological and audiological explanations for this phenomenon.
Approach
Researchers investigated two primary hypotheses concerning individuals who report hearing 'The Hum.' The first hypothesis examined whether these individuals possess exceptional low-frequency hearing capabilities. The second hypothesis explored the presence of measurable sounds originating inside their ears, specifically otoacoustic emissions, which could potentially be misperceived as an external hum.
Findings
Investigations into the hearing abilities of participants who reported hearing 'The Hum' did not consistently demonstrate exceptional low-frequency hearing. Similarly, tests for measurable sounds produced internally within the ear, such as otoacoustic emissions, did not provide an explanation that was applicable to the majority of participants. Consequently, these initial hypotheses were not widely supported as primary explanations for the reported phenomenon.
The research indicated that a more plausible explanation for many instances of 'The Hum' involves low-frequency tinnitus. This suggests that while individuals perceive the sound as originating externally, its genesis may be an internal auditory perception characteristic of tinnitus, specifically in the low-frequency range.
Why This Matters
Understanding the potential mechanisms behind 'The Hum,' particularly the role of low-frequency tinnitus, offers a direction for clinical assessment and management for individuals experiencing this persistent and often distressing auditory perception. Characterizing it as a form of tinnitus could shift diagnostic and therapeutic approaches.