Nine children suffering from Landau-Kleffner (L-K) syndrome and 25 children with developmental expressive disorders were tested for comprehension of English grammatical structures in spoken, written, and signed language modalities. L-K children demonstrated comprehension problems in all three language modalities and tended to treat language as…

Down Syndrome children exhibit language delays, particularly in expressive abilities, more severe than would be anticipated from their cognitive level alone. This research project sought to develop a procedure for introducing total communication into the home environment of prelinguistic Down Syndrome infants and for comparing the relative…