
doi: 10.1121/1.4783533
Cross-sectional and longitudinal studies of speech-sound development utilizing phonetic transcription often show an apparently discontinuous acquisition of speech sounds. Instrumental studies, in contrast, suggest that children acquire speech-sound contrasts gradually. An ideal perceptual-rating measure of children’s production should capture this gradient change in production, correlate well with acoustic data, and be fast and easy both to administer and to score. A previous experiment in our laboratory compared three methods of collecting continuous judgments of children’s consonant productions of /s/ and /∫/: Of the three, visual analog scaling (VAS) correlated best with acoustic parameters. However, as was administered in that experiment, VAS allowed only two-way comparisons between phonemes. To determine whether VAS could be used for multiple-way comparisons, two experiments were conducted. In the first, participants first made a forced choice between two phonemes, then used VAS to make a judgment of the goodness of the phoneme, from perfect to bad. A second experiment was conducted using a seven-point EAI scale in place of the VAS. The results will be correlated with acoustic data as in the previous experiment and will further our knowledge of optimal methods for measuring children’s speech production perceptually.
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