Vocabulary growth was suggested to prompt the implementation of increasingly finer-grained lexical representations of spoken words in children (e.g., [Metsala, J. L., & Walley, A. C. (1998). "Spoken vocabulary growth and the segmental restructuring of lexical representations: precursors to phonemic awareness and early reading…

Illiterate adults could neither delete nor add a phone at the beginning of a non-word; but these tasks were performed by people who learned to read rudimentarily as adults. Awareness of speech as a sequence of phones is thus not attained spontaneously but is probably provided by learning to read. (Author/CP)