Language abilities in two twin pairs, in which one twin suffered perinatal left hemisphere brain injury, were studied from the age of 23-30 months to 41-46 months. Twins performed similarly on tests of mental development, picture vocabulary, and receptive language, but brain-injured twins' scores were lower than controls' on expressive language.…

Children who used chloride-deficient soy-based infant formulas (Neo-Mull-Soy and Cho-Free) have been found to exhibit expressive language disorders. Medical studies of such children are reviewed, and a case study compares the language development deficits of an eight-year-old boy who used the formula with that of his fraternal twin who did not.…

This study analyzed storybook reading sessions involving a mother and her three-year-old twin daughters, one of whom was deaf. The mother asked the hearing twin almost twice as many questions as she asked of the deaf twin, and asked the hearing twin primarily conventional test questions, but she asked the deaf twin more gestural questions.…

A comparison is presented of a mother's language to her Down Syndrome two-year-old and his normally developing twin. When interacting with the Down Syndrome twin, the mother used shorter mean length of utterance, greater type-token ratio, more confirmations, more verbal directives, fewer yes-no and true questions, and more directive questions.…