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Causes and Consequences of Higher Auditory Pathway Lesions

Explore the diverse causes leading to higher auditory pathway lesions, including conditions like multiple sclerosis, tumors, and acoustic neuromas. Learn about the consequences, such as progressive hearing loss, vertigo, and speech-understanding problems that accompany these lesions. Discover how auditory processing disorders, like CAPD, manifest and can be diagnosed through various tests based on intrinsic and extrinsic redundancy.

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Causes and Consequences of Higher Auditory Pathway Lesions

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  1. Causes of higher auditory pathway lesions Auditory nerve Acoustic neuromas Acoustic neuritis (inflammation) Multiple sclerosis Higher centers Cerebrovascular accidents Rh incompatibility Tumours Age Syphilis

  2. Consequences Progressive hearing loss, may be unilateral Vertigo, tinnitus, headache, vomiting, respiratory symptoms Speech-understanding problems that are greater than that predicted by degree of hearing loss In some cases, audiogram may look normal

  3. Auditory processing disorders Also referred to as central auditory processing disorder (CAPD). Difficulty processing auditory information in the absence of a concomitant loss of peripheral hearing sensitivity.

  4. Tests for diagnosing APD Based on intrinsic and extrinsic redundancy Example: Binaural fusion test Filtered speech tests Synthetic Sentence Identification with Ipsilateral/Contralateral competing message Staggered Spondaic Word test Masking level difference Time-compressed speech

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