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Journal of Speech, Language, and Hearing Research Vol.41 1432-1443 December 1998.
© American Speech-Language-Hearing Association
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Real-Time Inflectional Processing by Children With Specific Language Impairment

Effects of Phonetic Substance

James W. Montgomery 1
Laurence B. Leonard 2
1 University of North Carolina at Chapel Hill
2 Purdue University

Jmontgomery{at}css.unc.edu

In this study, we examined the processing of low-phonetic- substance inflections (e.g., third-person-singular -s, past-tense -ed) versus a higher-phonetic-substance inflection (e.g., present-progressive -ing) by children with specific language impairment (SLI) in two types of receptive tasks. Twenty-one children with SLI (Age: 8 years;6 months), 21 chronological age matched (CA; Age: 8;7), and 21 receptive syntax matched (RS; Age: 6;8) children participated in a word-recognition reaction time (RT) task and an off-line task requiring grammaticality judgments. On the RT task, the children with SLI demonstrated RT sensitivity only to the presence of a higher-phonetic-substance inflection, unlike the CA and RS controls who displayed sensitivity to both higher-substance and low- substance inflections. On the grammaticality judgment task, the children with SLI performed more poorly than the CA controls only on sentences missing obligatory low-substance inflections (e.g., "Carl already jump over the fence"). The findings are discussed within the framework of the surface account, which predicts that children with SLI should have greater difficulty processing and making grammatical judgments about low-substance inflections compared to higher-substance inflections.

KEY WORDS: specific language impairment, grammatical morphology, real-time processing

Submitted on October 1, 1997
Accepted on April 17, 1998


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