Primate communication and language development / Charles T. Snowdon -- Cognition and language / Susan Ellis Weismer and Elin T. Thordardottir -- Language development : does the environment matter? / Betty Hart -- Sensitive periods in the development of language of children who are deaf or hard of hearing / Christine Yoshinaga-Itano -- Otitis media : is there a relationship to language development? / Robert J. Ruben -- A neurodevelopmental approach to the child with delayed language / Mary L. O'Connor Leppert -- The child who does not talk : a pediatric overview / Pasquale J. Accardo -- Neuroimaging and disorders of communication / William Davis Gaillard, Ben Xu, and Lyn Balsamo -- Treatment of primary language disorders in early childhood : evidence of efficacy / Paul J. Yoder and Andrea S. McDuffie -- Language and academic outcomes of children with preschool language disorders / Carla J. Johnson and Joseph H. Beitchman.