Temporal alterations to central auditory processing without synaptopathy after lifetime exposure to environmental noise
- Occelli, Florian
- Hasselmann, Florian
- Bourien, Jérôme
- Puel, Jean-Luc
- Desvignes, Nathalie
- Wiszniowski, Bernadette
- Edeline, Jean-Marc
- Gourévitch, Boris
DOIAbstract
International audiencePeople are increasingly exposed to environmental noise through the cumulation of occupational and recreational activities, which is considered harmless to the auditory system, if the sound intensity remains <80 dB. However, recent evidence of noise-induced peripheral synaptic damage and central reorganizations in the auditory cortex, despite normal audiometry results, has cast doubt on the innocuousness of lifetime exposure to environmental noise. We addressed this issue by exposing adult rats to realistic and nontraumatic environmental noise, within the daily permissible noise exposure limit for humans (80 dB sound pressure level, 8 h/day) for between 3 and 18 months. We found that temporary hearing loss could be dete...
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