Why you temporarily hear muffled sound after a loud noise

Photo credit: Katie Tegtmeyer licensed under CC BY 2.0

by Daniel Fink, MD, Chair, The Quiet Coalition

Noise-induced temporary threshold shift, or NITTS, describes the temporary muffling of sound after a person is exposed to loud noise. This article from the American Association for the Advancement of Science’s Eureka Alert details a report in the prestigious scientific journal Proceedings of the National Academy of Sciences, that provides an explanation for NITTS. Namely, researchers in Sweden found changes in calcium ions in the tectorial membrane of the cochlea.

While NITTS is a real and observable finding, the idea that auditory damage from noise is temporary is most likely false. Research by Liberman and Kujawa and colleagues at the Massachusetts Eye and Ear Infirmary strongly suggests that there is no such thing as temporary auditory damage. And decades of occupational noise exposure studies show that NITTS eventually becomes NIPTS, noise-induced permanent threshold shift, i.e., noise-induced hearing loss. That is, your awareness of muffled hearing following exposure to loud noise is temporary, but the damage caused by the loud noise is permanent.

Noise-induced hearing loss is 100% preventable. Avoid noise exposure and if one can’t avoid noise exposure, use hearing protection devices.

Because if it sounds too loud, it IS too loud!

Dr. Daniel Fink is a leading noise activist based in the Los Angeles area. He is the founding chair of The Quiet Coalition, an organization of science, health, and legal professionals concerned about the impacts of noise on health, environment, learning, productivity, and quality of life in America. Dr Fink also is the interim chair of Quiet Communities’ Health Advisory Council, and he served on the board of the American Tinnitus Association from 2015-2018.

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