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Examples of prelinguistic vocalizations

Quasi-voiced sound: produced with partially closed vocal tract, not fully resonant.

Fully-voiced sound: produced with an open vocal tract, fully resonant with a clear formant structure.

Marginal syllable: although approximating speech-like syllables with consonant-vowel clusters, the long  consonant-vowel (CV) transition does not reflect well formed speech.

Canonical syllable: well-formed consonant-vowel clusters with rapid CV transition.

Reduplicated babble: repetitive string of canonical syllables.

Time-frequency spectrograms made using Igor Pro and BSound software written by Brian Nelson.

BSound is available at http://homepage.mac.com/bsnelson/BSound.html