Precocity of the acquisition of language and type II spinal muscular atrophy in 3-4-year-old children: a study of 12 cases.

We studied the development of language in 3-4-year-old children with type II spinal muscular atrophy (SMA) (10 boys and two girls), aged 36-47 months (mean age 39.83+/-4.68 months) and compared our findings to a control group of 26 healthy children (mean age 40.00+/-4.43 months, 22 boys and four girls). We carried out a lexicogrammatical analysis of the data and we observed significant differences in the "vocabulary", "nouns", "verbs", "words" and "adverbs" variables between the children with SMA and the controls. Three- to four-year-old children suffering from type II spinal muscular atrophy, an autosomal genetic disease causing severe physical handicap (motor, functional, respiratory), presented a higher level of lexical and semantic development than the controls, demonstrating the precocity of development of morphosyntax in these children.