![]() ![]() There are still many confusions between peripheral and central APD as well as between APD and auditory neuropathy spectrum disorders (ANSD). It seems clear that not all APD have a central origin and that the notion of “central” auditory processing disorders should be reviewed. This peripheral dys-coding will be more or less reprinted at the upper levels of the auditory pathways. Indeed, an abnormal peripheral cochlear coding of sound features (spectral, intensity, temporal) could be responsible of APD. Notably, this latter definition is not correct because the exact origin is unknown and may be localized wherever from the outer hair cells (OHC) to top of auditory pathway, involved in cognition-related mechanisms of auditory perception. Many synonyms and confusions are related to this set of hearing dysfunctions: “Hidden deafness”, “auditory processing disorders (APD)”, “supraliminal hearing disorders”, “auditory synaptopathy” or even “Central” hearing disorders. The prevalence of this hidden deafness is reported between 5 and 15%. ![]() They have a preserved audibility but degraded intelligibility. Some subjects present isolated hearing disorders for speech discrimination in difficult auditory conditions with normal tonal and speech audiometry in quiet and normally synchronized auditory brainstem responses (ABR). Auditory processing disorders, auditory synaptopathy, central hearing disorders, hidden deafness, supraliminal hearing disorders, supra-liminal tests
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