In this entry, the term hearing impaired/impairment (HI) refers to any deviation from the range of hearing considered to be normal (NH) and also covers the terms hard of hearing and deaf. The entry focuses on language disorders caused only by HI and does not deal with conditions in which HI is explicitly excluded (e.g., specific language impairment) or is part of a syndrome or accompanied by other impairments (e.g., aphasias, Down syndrome).

Hearing Loss

Hearing loss (HL) is described along several criteria: type/nature, degree/severity, etiology/causes, and configuration/shape, all described in this section. The type of HL is determined with reference to the part of the auditory system that is impaired. Conductive HL occurs when there is an obstacle to sound conduction in the outer ear and ...

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