Verb argument structure weakness in specific language impairment in relation to age and utterance length.

In spite of the complexity of verb argument structure, argument structure errors are infrequent in the speech of children with specific language impairment (SLI). The study examined the spontaneous argument structure use of school-age children with SLI and with normal language (NL) (n = 100). The groups did not differ substantially in frequency of argument structure errors, particularly when pragmatic context was considered. However, children with SLI used significantly fewer argument types, argument structure types and verb alternations than age-matched children with NL. Further, significant differences between children with SLI and mean length of utterance-matched controls were found involving the use of three-place argument structures. The results show that children with SLI demonstrate mostly correct, but less sophisticated, verb argument structure use than NL peers, and that the difference is not merely attributable to production limitations such as utterance length. The possibility of incomplete argument structure representation is suggested.