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Input sources of third person singular -s inconsistency in children with and without specific language impairment*

Published online by Cambridge University Press:  30 July 2014

LAURENCE B. LEONARD*
Affiliation:
Purdue University
MARC E. FEY
Affiliation:
University of Kansas Medical Center
PATRICIA DEEVY
Affiliation:
Purdue University
SHELLEY L. BREDIN-OJA
Affiliation:
University of Kansas Medical Center
*
Address for correspondence: Laurence B. Leonard, Department of Speech, Language, and Hearing Sciences, Lyles-Porter Hall, Purdue University, West Lafayette, IN 47907, USA. e-mail: xdxl@purdue.edu

Abstract

We tested four predictions based on the assumption that optional infinitives can be attributed to properties of the input whereby children inappropriately extract non-finite subject–verb sequences (e.g. the girl run) from larger input utterances (e.g. Does the girl run? Let's watch the girl run). Thirty children with specific language impairment (SLI) and thirty typically developing children heard novel and familiar verbs that appeared exclusively either in utterances containing non-finite subject–verb sequences or in simple sentences with the verb inflected for third person singular -s. Subsequent testing showed strong input effects, especially for the SLI group. The results provide support for input-based factors as significant contributors not only to the optional infinitive period in typical development, but also to the especially protracted optional infinitive period seen in SLI.

Type
Articles
Copyright
Copyright © Cambridge University Press 2014 

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Footnotes

[*]

This research was supported by research grant R01 DC009574 from the National Institute on Deafness and Other Communication Disorders, National Institutes of Health. The authors would like to thank the children and their families for their participation.

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