Using the Leonard corpus which is collected before the formulation of the Agreement and Tense Omission Model, the Agreement Deficit Model, and the Deficit in Computational Grammatical Complexity Model, the present study tries to evaluate these three accounts of SLI and to figure out the nature of grammatical errors made by children with SLI. It is found that the children with SLI in the Leonard corpus frequently commit errors on tense marking, agreement marking, and auxiliary inversion, but correctly perform other syntactic operations such as case assignment, A-movement, and Wh-movement. However, in terms of Chomsky's Minimalist Program (1998, 1999, 2001, 2005), it is shown that SLI involves a PF deficit rather than a syntactic deficit. As a result, it is found that none of the three linguistic models of SLI is compatible with this finding.
Proceedings of the 2nd Conference on Generative Approaches to Language Acquisition North America (GALANA)
edited by Alyona Belikova, Luisa Meroni, and Mari Umeda
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