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Journal of Speech, Language, and Hearing Research Vol.42 678-689 June 1999.
© American Speech-Language-Hearing Association
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Grammatical Morphology and the Lexicon in Children With Specific Language Impairment

Laurence B. Leonard 1
Carol Miller 1

Erika Gerber 1
1 Purdue University West Lafayette, IN

xdxl{at}purdue.edu

We examined the use of grammatical morphology by preschool-age English-speaking children with specific language impairment (SLI) as a function of their lexical diversity. Relative to a group of normally developing (ND) preschoolers, these children's use of finite-verb morphology lagged behind expectations based on the number of different verbs they used. Noun-related morphology fell below expectations based on overall lexical diversity. Differences between the ND children and children with SLI were also seen for the slope of the increases in finite-verb morphology as a function of lexical diversity, with shallower slopes in the SLI data. The findings of this study add to existing evidence suggesting that a measure of finite grammatical-morphology use has promise as a clinical marker of SLI in English.

KEY WORDS: specific language impairment, grammatical morphology, lexicon, language disorders (in children), grammar

Submitted on April 14, 1998
Accepted on October 1, 1998


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