Abstract
Sounds recorded on a longitudinal basis from infants of two to eight weeks were classified as cry, discomfort, or vegetative sounds. Five examples of each of these three classes of sounds were selected randomly from the output of three different infants. The selection was made for each of the three infants at two, four, and eight weeks of age. The cry, discomfort, and vegetative sounds were submitted to analysis of auditory and spectrographic features. Duration of segments, that is, portions of an utterance bounded by noise, and the temporal patterning of these segments, i.e., the number occurring in a series and the relative duration of segments within a series, were determined. Significant differences were found across the three sound classes, but not across age levels, with respect to (1) clustering of auditory and spectrographic features, (2) segment duration, and (3) temporal patterning. The possible importance of these findings for speech sound development after eight weeks of age is discussed. [Research Support by NINDS.]
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