Two cases of fluent aphasia with selective difficulty of syllable identification by

Keiko Endo, Kyoko Suzuki, Atsushi Yamadori, Toshikatsu Fujii, Mari Tobita, Hiroya Ohtake

Research output: Contribution to journalArticle

Abstract

We report two aphasie patients who could discriminate Japanese syllables but could not identify them. Case 1 was a 5f-year-old right handed woman with 12-year education. Case 2 was a 50-year-old right handed man with 9-year education. They developed fluent aphasia after a cerebral infarction. Brain MRI of case 1 revealed widely distributed lesions including inferior frontal, superior temporal, angular and supramarginal gyri. Lesions revealed by Brain CT in case 2 included the left superior and middle temporal, angular and supramarginal gyri. Both showed severe impairment of repetition and confrontation naming. No difference of performance was present between repetition of single syllables and polysyllabic words. On the contrary, oral reading of Kana characters were preserved. We examined their ability to perceive syllables in detail. In the discrimination task, they judged whether a pair of heard syllables was same or different. Case 1 was correct in 85% of the tasks and case 2 in 98%. In an identification task, they heard a syllable and chose a corresponding Kana, Kanji, or picture out of 10 respective candidates. Case 1 was correct only in 30% and case 2 in 50% of these tasks. On the other hand, selection of a correct target in response to a polysyllabic word was much better, i. e. 70% in case 1 and 90% in case 2. Based on these data we concluded that (1) syllabic identification is a different process from syllabic discrimination, and (2) comprehension of a polysyllabic word can be achieved even when the precise phonological analysis of continuent syllables are impaired.

Original languageEnglish
Pages (from-to)901-906
Number of pages6
JournalBrain and Nerve
Volume51
Issue number10
Publication statusPublished - 1999 Dec 1

Keywords

  • Cerebral infarction
  • Fluent aphasia
  • Phonological discrimination
  • Phonological identification
  • Repetition

ASJC Scopus subject areas

  • Neuroscience(all)

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    Endo, K., Suzuki, K., Yamadori, A., Fujii, T., Tobita, M., & Ohtake, H. (1999). Two cases of fluent aphasia with selective difficulty of syllable identification by. Brain and Nerve, 51(10), 901-906.