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The following are three case studies with different reasons for cortical deafness. A case published in 2001 describes the patient as 20-year-old man referred for cochlear implants because of bilateral deafness following a motorcycle accident two years earlier. [2] His CT shows hemorrhagic lesions involving both internal capsules. He was ...
In one case study, each of the three sound types (music, environmental sounds, speech) was also shown to recover independently (Mendez and Geehan, 1988-case 2 [22]). It is yet unclear whether general auditory agnosia is a combination of milder auditory disorders, or whether the source of this disorder is at an earlier auditory processing stage.
Auditory processing disorder (APD), rarely known as King-Kopetzky syndrome, is a neurodevelopmental disorder affecting the way the brain processes sounds. [2] Individuals with APD usually have normal structure and function of the ear, but cannot process the information they hear in the same way as others do, which leads to difficulties in recognizing and interpreting sounds, especially the ...
Based on clinical testing of subjects with auditory neuropathy, the disruption in the stream of sound information has been localized to one or more of three probable locations: the inner hair cells of the cochlea, the synapse between the inner hair cells and the auditory nerve, or a lesion of the ascending auditory nerve itself.
In fact, a recent study co-authored by Dr. Lin found that those with moderate to severe hearing loss were at a higher risk of developing dementia compared to those with normal hearing.
Auditory verbal agnosia can also occur as a result of traumatic brain injury. In one case, a man fell and developed auditory verbal agnosia. This can be challenging to diagnose because he had fluent speech and could understand written language. However, he was unable to follow oral commands or repeat words.
In this case the single speech stream enters both ears and its representation ascends the two auditory pathways. [5] The stream arrives at both the right and left auditory cortices for eventual speech processing by the left hemisphere. In a noisy environment the MOC efferent pathways are required to be active in two distinct ways. The first is ...
Persons with Pierre Robin sequence (PRS) are at greater risk for hearing impairment than persons with cleft lip and/or palate without PRS. One study showed an average of 83% hearing loss in PRS, compared to 60% in cleft individuals without PRS (Handzic et al., 1995). Similarly, PRS individuals typically exhibit conductive, bilateral hearing ...