What is the definition of a "noise notch" in audiometry?

The term "noise notch" refers to a specific pattern observed in audiograms that indicates noise-induced hearing loss, particularly characterized by a drop in auditory thresholds at specific frequencies. This phenomenon typically manifests as a distinctive gap or notch at the frequencies that are most affected by prolonged exposure to loud sounds, often around 3000 to 6000 Hz. The presence of this notch can serve as an important diagnostic indicator, helping audiologists identify individuals who may have experienced damage to their hearing as a result of occupational or recreational noise exposure.

In contrast, while other choices mention various auditory phenomena, they do not specifically define the characteristic pattern associated with noise-induced hearing loss. A sharp increase in thresholds at high frequencies is more general and does not capture the specific notch pattern. A temporary threshold shift, while related to noise exposure, refers to short-term changes rather than a persistent notch in audiometric readings. Finally, a measure of overall auditory health may encompass a broader range of auditory measures and does not specifically outline the peculiar notch indicative of noise-induced damage. Thus, the definition aligning with noise notch is firmly rooted in the audiometric pattern relevant to noise-related hearing impairments.