Oral and written language in a case of childhood phonemic deafness.
Neuropsychologic and neurolinguistic studies performed on an 11-year-old Landau-Kleffner boy are reported. At age 3 his language began to deteriorate progressively until complete disappearance. At the same time, the patient developed epileptic seizures. When 6 years old, he was taught to match objects to the corresponding written word, and subsequently he was able to learn reading and writing to such extent that he could attend primary school. BAER and primary cortical auditory responses were normal, whereas late cortical components were grossly retarded and distorted. Phonemic discrimination, identification, and production were absent, and in contrast, lexical-semantic abilities tested through reading and writing were normal. In visual STM tasks, phonologic mediation was absent. The role of phonologic mediation in language acquisition is then hypothesized.
D002648:Child; D003638:Deafness / Q000175:diagnosis*; D004827:Epilepsy / Q000175:diagnosis; D005072:Evoked Potentials, Auditory; D006801:Humans; D007805:Language Development Disorders / Q000175:diagnosis*; D008297:Male; D009483:Neuropsychological Tests; D010700:Phonetics; D011932:Reading; D012660:Semantics; D013067:Speech Perception; D013068:Speech Production Measurement; D014796:Visual Perception; D014956:Writing