Abstract
Children increasingly confront complex sentences as they progress through the school years. Sentence
structures including passives and relative clauses are specifically mentioned in school curricular standards,
and children encounter these in the context of conversations, books, and movies. For the 7-13% of children
with a Developmental Language Disorder, the challenge posed by complex sentence comprehension and use
can contribute to poor academic achievement and negative social interactions. Yet the bulk of oral language
treatment focuses on vocabulary growth and grammatical morpheme errors in the preschool years, with scant
attention to later-developing language skills. This grant proposes to compare two entirely new treatments for
complex syntax. Two randomized clinical trials will test the effects of philosophically contrastive treatment
approaches that represent opposing points on an explicit-to-implicit continuum of language intervention. We
hypothesize that treatment methods in which children are taught to explicitly apply syntactic rules will produce
high in-treatment performance, but at the cost of the automatic, implicit knowledge required for rapid and
unconscious application to untrained linguistic contexts. Conversely, treatment intended to facilitate implicit
learning of syntactic forms will result in incremental in-treatment gains but will ultimately result in a more
generative knowledge and use of complex syntactic forms. We seek to replicate findings by conducting
separate clinical trials for the treatment of passive sentences and sentences with relative clauses. In addition to
supplying clinicians with much needed information concerning treatment effectiveness, the data will provide an
important theoretical test of causal components of our recently developed model of complex sentence
comprehension and use in children with Developmental Language Disorder.
Health relevance
The grant proposes to test new treatments for complex sentence knowledge and use, for which there is little in
the way of effective intervention. The grant will directly test the efficacy of two approaches to language
treatment (explicit training of language rules vs. implicit learning of syntactic structures) and will assess
different models of the causal relationships among cognitive factors and treatment outcomes.