Abstract
The “closant curve” reflects the change in ratio of the frequency of consonants (closants) to vowels (vocants) in early vocal and speech development of young children (Bauer, 1988). Closant curves were plotted for seven children's monthly vocalizations across the first 2 years of life. The closant curves were then compared to monthly data plots of each child's vocal fundamental frequency and vocalization duration. Assessment of developmental trends for the phonetic and acoustic data was based on visual examination of the data plots and curve fitting procedures. The resulting developmental functions are discussed in relation to the reported closant curves underlying environmental and physiological characteristics of language acquisition. These analyses provide an acoustic and phonetic framework from which to study early speech development. [Work supported by U. H. Research Council.]
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