Development
Early vocal development in typically developing infants is characterized by the gradual emergence of increasingly complex and speech-like utterances during the first two years of life (Oller, 1980; Stark, 1980). This period of non referential vocalization is generally recognized as a foundation for meaningful speech and phonological development (Vihman, 1996; Stoel-Gammon, 1998).
Vocal development can be divided into three main stages: Precanonical, Basic Canonical Syllables, and Advanced Forms.
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Copyright Purdue University, 2001