The goal of this study was to explore whether viewing the speaker’s articulatory gestures contributes to lexical access in children (ages 5–10) and in adults. The authors suggest that visual speech mostly contributes to phonemic—rather than lexical processing during childhood, at least until the age of 10.
Fort, Mathilda, Spinelli, Elsa, Savariaux, Christophe, and Kandel, Sonia. (2012). Audiovisual vowel monitoring and the word superiority effect in children. International Journal of Behavioral Development, 38, 457-467.