Comprehension of Welcher-Questions in German-Speaking Children With and Without Developmental Language Disorder

Purpose This study examined whether monolingual German-speaking preschool children with developmental language disorder (DLD) were facilitated by the presence of case-marking cues in their interpretation of German subject and object welcher ("which")-questions, as reported for their typically developing peers. We also examined whether knowledge of case-marking and/or phonological working memory modulated children's ability to revise early assigned interpretations of ambiguous questions. Method Sixty-three monolingual German-speaking children with and without DLD aged between 4;0 and 5;11 (years;months) participated in an offline picture selection task targeting the comprehension of welcher-questions in German. We manipulated question type (subject, object), case-marking transparency, and case-marking position within the question (sentence-initial/-final). Results The typically developing children outperformed the children with DLD across conditions, and all children performed better on subject than on object wh-questions. Transparent and early cues elicited higher accuracy than late-arriving cues. For the DLD children, their working memory capacity explained their inability to revise early assigned interpretations to ambiguous questions, whereas their knowledge of case did not. Conclusions The results suggest that disambiguating morphosyntactic cues can only partly facilitate comprehension of German welcher-questions in children with DLD, whose poor phonological working memory rather than their knowledge of case-marking mediates performance on these structures.