Role of early cognition/language in later language ability during childhood - A longitudinal comparison study.

Background: Many factors may influence early language development, but the precise impact of cognitive development remains unclear.

Aims: This study aims to explore how cognitive development contributes to language ability and to compare the explanatory value of early cognitive and language ability at 2;0 (years;months) on the language ability at 3;6 and at 5;0.

Methods: Sixty-one typically developing children were followed up.

What kind of information do early parental report instruments provide on language ability at 3;6 when used at 2;0? A longitudinal comparison study.

Introduction: Various parental report instruments are available for assessing children's language skills at the end of the second year. However, comparison studies on their usability are lacking, and it is also open to question what kind of information the instruments provide when used in a parallel manner. This longitudinal study investigated which of the available three parental report instruments, when used at 2;0 (year;month), provides the most representative information on language development at 3;6.