![]() ![]() The most common cause is cerebrovascular disease. To our knowledge, auditory agnosia is caused by cerebrovascular diseases such as: a stroke, viral infection of central nervous system (CNS), head trauma, brain tumor, hydrocephalus and variable CNS lesions. The results of evaluation studies are summarized in Table 1. The visuo-cognitive and visuo-spatial functions were preserved. ![]() Also brainstem auditory-evoked potentials (BAEP) exhibited normal bilateral latencies ( Fig. ![]() The standard pure tone threshold audiometry showed normal findings ( Fig. Standard pure tone threshold audiometry was conducted. Everything sounded like a disagreeable noise, a "buzzing", including pure tone signals. He could not differentiate people's voices, music, and environmental sounds. Therefore, he was regarded as not having severe cognitive dysfunction for his age and educational status. He obtained a score of 21/30 on MMSE-K with written communication. He came close to be misdiagnosed as Wernicke's aphasia but, his language disorder was different from Wernicke's aphasia for naming, reading and spontaneous writing. The Token test was 0% for verbal communication but 20.9% (13 items out of 62) for written communication. He could speak complete sentences without paraphasia. A language assessment using the Korean Version of the Western Aphasia Battery (K-WAB) revealed that he had significant deficits in auditory comprehension, repetition, and writing to dictation, despite the presence of good reading, fluent speech, and spontaneous writing, without evidence of aphasia. But he could comprehend written and gestural communication. He was diagnosed as having cognitive dysfunction. He obtained a score of 4/30 on the Mini Mental State Exam of Korea (MMSE-K) with verbal communication. Neuropsychological evaluations were performed 3 weeks after the onset of stroke. His verbal repetition and writing to dictation were severely defective with phonemic substitutions. He was an alert patient but, he did not follow oral commands or respond to environmental sounds. Keywords: Auditory agnosia, Unilateral subcortical lesion ![]() This case suggested that the subcortical lesion involving unilateral acoustic radiation could cause generalized auditory agnosia. His auditory brainstem evoked potential and audiometry were intact. He could understand and read written words and phrases. He was not able to repeat or dictate but to perform fluent and comprehensible speech. We present a 73-year-old right-handed male with generalized auditory agnosia caused by a unilateral subcortical lesion. Subcortical lesions without cortical damage rarely causes auditory agnosia. Usually, either the bilateral or unilateral temporal lobe, especially the transverse gyral lesions, are responsible for auditory agnosia. Auditory agnosia is a deficit of auditory object processing defined as a disability to recognize spoken languages and/or nonverbal environmental sounds and music despite adequate hearing while spontaneous speech, reading and writing are preserved. The mechanisms and functional anatomy underlying the early stages of speech perception are still not well understood. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |