A study of a two-stage hypothesis for phonological processing: Analysis of phonological paraphasia in conduction aphasia Yasuhiro Miyazaki 1 , Jun Tanemura 1 1Department of Sensory Sciences, Kawasaki University of Medical Welfare Keyword: 伝導失語 , 音韻性錯語 , 音韻処理過程 , 誤反応分析 , 頻度効果 , conduction aphasia , phonological paraphasia , phonological processing , analysis of error response , frequency effect pp.121-129
Published Date 2015/9/15
DOI https://doi.org/10.11477/mf.6001200047
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 This study analyzed phonological paraphasia in conduction aphasia and verified the two-stage hypothesis of phonological processing proposed by Goldrick et al. (2007). The subjects included 11 patients (9 males and 2 females) with conduction aphasia. The analysis investigated the effect of frequency of target words on phonological paraphasia (frequency effect) and the features of phonemic errors during the naming task in the Standard Language Test of Aphasia (SLTA) and its supplementary test (SLTA-ST). The features of phonemic errors were analyzed according to the following four points: (1) location of phonemic error (start, middle, or end of word), (2) type of phonemic error (substitution, addition, omission, or transposition), (3) direction of phonemic error (forward: later phoneme produced earlier within a word, or backward: earlier phoneme produced later), and (4) articulation features (consonants or vowels). Phonological paraphasia occurred in 25.5±11.5 words (out of 100 total words). Some patients showed frequency effect, while others didn't. The features of phonemic errors differed among patients. The patients whose type of aphasia changed from Wernicke's aphasia to conduction aphasia during the recovery and those who had been classified as conduction aphasia from the onset were qualitatively different. These features of phonemic errors can be explained by a language processing model which postulates that there are two stages for phonological processing: lexical phonological processing and post-lexical phonological processing.

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