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KMID : 1036820140190010080
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Communication Sciences & Disorders
2014 Volume.19 No. 1 p.80 ~ p.88
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Word Frequency and Length Effects on the Lexical Decisions of Adults with Anomic Aphasia
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Jung Hye-Won
Choi So-Young
Hwang Min-A
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Abstract
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Objectives: The goal of this study was to investigate the effects of word frequency and word length on the word comprehension of adults with anomic aphasia using a lexical decision task (LDT).
Methods: The participants consisted of 25 adults with anomic aphasia (AA) and 25 normal adults (NA) with matching gender and educational levels. They performed a LDT that contained words of high- or low-frequencies and of two or four syllables.
Results: The AA group showed significantly lower accuracy and longer reaction times (RTs) compared to the NA group in their performances on the LDT. The main effects of word frequency and word length were significant in both the performance accuracy and the RT, that is, the participants’ performance accuracies were higher and their RTs were shorter when they encountered words that were of high-frequency and of two-syllable lengths. Particularly, both effects were greater in the AA group than in the NA group; however, only in relation to the RTs. Significant interaction between word frequency and word length was also observed.
Conclusion: The effects of word frequency and word length on normal adults’ lexical processing have been repeatedly reported. It was observed in this study that such effects were greater in the AA group than the NA group. It is suggested that the lexical processes of adults with anomic aphasia are fundamentally similar to those of normal adults. Nevertheless, adults with anomic aphasia are less effective at accessing lexical-semantic information.
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KEYWORD
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Anomic aphasia, Lexical decision task, Word frequency effect, Word length effect
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