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

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 2 2

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. 3

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 4