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Hearing loss due to abnormality of neural connections between the inner ear (cochlea) and, or in, the auditory nerve has been dubbed “hidden hearing loss” and is the subject of considerable recent research. Like APD, it is not detected by basic hearing tests. However APD is a far more prevalent condition than cochlear synaptopathy.
Musiek, F. E., Chermak, G. D., Bamiou, D. E., & Shinn, J. (2018). CAPD: The Most Common ‘Hidden Hearing Loss’ Central auditory processing disorder—and not cochlear synaptopathy—is the most likely source of difficulty understanding speech in noise (despite normal audiograms). The ASHA Leader, 23(3), 6-9.
Read the full article at the link below.
https://leader.pubs.asha.org/doi/full/10.1044/leader.FMP.23032018.6