“…At the beginning of the 20th century, several studies were conducted to characterize this delay, which appears to affect all components of language (phonology, lexicon, and syntax; see Day, 1932), and to determine the features of the autonomous languages of twins (e.g., Luria & Youdovitch, 1956). By the end of the century, findings obtained in psycholinguistic and pragmatic research led a number of investigators (McEvoy & Dodd, 1992;McEvoy & Dodd, 1994;Tomasello et al, 1986;Tomasello et al, 1989) to take an interest in the processes that might account for the language lag, and to cast doubt on the existence of autonomous languages (Bakker, 1987).…”