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KMID : 1036820170220010117
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Communication Sciences & Disorders
2017 Volume.22 No. 1 p.117 ~ p.128
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Effects of Lexicality and Regularity on Reading Aloud Performance in Aphasia
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Kim Woon-Jeong
Sung Jee-Eun
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Abstract
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Objectives: The purpose of the study was to evaluate the reading ability of persons with aphasia (PWA) according to lexicality and regularity.
Methods: Twenty individuals with aphasia and 20 age- and education-matched normal individuals participated in the study. Experimental stimuli were manipulated based on the lexicality and regularity of two-syllable structures at word-level. Accuracy (%) served as a dependent measure, and the types of error were analyzed.
Results: For the reading accuracy, PWA performed significantly worse than the control group. Participants demonstrated greater difficulties in reading non-words and irregular words across the groups. The two-way interaction between group and lexicality was significant, indicating that PWA demonstrated greater difficulties in reading non-words than words compared to the control group. Regression analyses revealed that regular non-word condition accounted for 47.7% of the total variance as a significant predictor. In the error type analyses, the error ratio of regular non-word condition was 71.74%, which was greater than that of word condition, 28.26%. Regularization error was 14.75% in non-word condition and 9.36% in word condition.
Conclusion: These results indicated that PWA demonstrated greater reading difficulties than the control group, and their performance was differentially affected by the lexicality. Lexicality seems to play a critical factor in differentiating PWA from the normal control group. The results are consistent with previous findings that suggested that non-word reading was more difficult than words. The current study suggested that overall severity of aphasia was predicted by regular non-word condition, which placed greater processing burden on grapheme-to-phoneme conversion.
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KEYWORD
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Aphasia, Reading, Lexicality, Regularity
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