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Grammatical errors in specific language impairment: Competence or performance limitations?

Published online by Cambridge University Press:  28 November 2008

D. V. M. Bishop
D. V. M. Bishop*
Affiliation:
MRC Applied Psychology Unit
*
MRC Applied Psychology Unit, 15 Chaucer Road, Cambridge CB2 2EF, England
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Abstract

Speech samples from twelve 8- to 12-year-old children with specific language impairment (SLI) were analyzed. The feature deficit hypothesis maintains that SLI children may produce morphological markers (e.g., plural -s) correctly, but they do not appreciate their role in marking grammatical features. Rather, they treat them as meaningless phonological variants. Findings from the present study were incompatible with this hypothesis: (a) production of morphological markers was not random; errors were unidirectional, in almost all cases involving omission of an inflection in an obligatory context; (b) overregularization errors were sometimes observed; (c) grammatical features differed in difficulty; (d) substitution of stems for inflected forms occurred with irregular as well as regular verbs; and (e) errors of pronoun case marking were common and always involved producing an accusative form in a context demanding the nominative. Children who used a specific inflectional form correctly in some utterances omitted it in others, suggesting a limitation of performance rather than competence. There were few obvious differences between utterances that did and did not include correctly inflected forms, though there was a trend for grammatical errors to occur on words that occurred later in an utterance. It is suggested that slowed processing in a limited capacity system that is handling several operations in parallel may lead to the omission of grammatical morphemes.

Type
Articles
Information
Applied Psycholinguistics , Volume 15 , Issue 4 , October 1994 , pp. 507 - 550
Copyright
Copyright © Cambridge University Press 1994

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References

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