The spontaneous speech of 3 children about 3 yr old was recorded and transcribed into C(n)V syllabic units. C(n) represents any number of consonants preceding a vowel and is not lexically constrained. Inconsistent production of /s/ and /z/ was related to motor sequencing constraints independent of word boundaries. The results support a model of speech physiology as well as theoretical formulations of child speech production within an adult phonological system.
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