Early verb-related vulnerability among children with specific language impairment.

The purpose of this study was to characterize the nature of early grammatical development among very young children with specific language impairment (SLI). Grammatical development was examined for two subtypes: (a) children with expressive language impairments only (SLI-E) and (b) children with both receptive and expressive language impairments (SLI-RE). In particular, characteristics of noun-phrase (NP) and verb-phrase (VP) elaboration were examined longitudinally to determine whether structures associated with NP and VP emerged together following a typical developmental progression. Group analyses did not reveal any differences between the subtypes on the Index of Productive Syntax (IPSyn; Scarborough, 1990). However, specific weakness in VP elaboration was revealed on the IPSyn as well as in more extensive productivity analyses. The contribution of these findings to a developmentally sensitive grammatical description of SLI for very young children is discussed.