The relationship between lexical and grammatical development in typical and brain-damaged children
Although there are many studies about the relationship between grammar and lexicon, there is a lack of studies examining the relationship between the growth of compound words and complex sentences. This study examined the relationship between compound words at the lexical level, and complex sentences, auxiliaries and modals, and coordinated subjects/objects at the grammatical level, for both brain-injured and typically developing children between the ages 4 and 6. For 10 typically developing children, 3091 utterances, and for 18 brain-injured children, 6460 utterances were examined. The results revealed that both groups showed a significant increase in the use of compound words and coordinated clauses. The growth of auxiliary and modal verbs is significant only for typically developing children and the growth of subordinate clauses is significant just for brain injured children. Moreover, there is an interaction between the growth of coordinate clauses and compound words just for brain injured children.