Abstract
When asked to speak clearly, talkers make adaptations to various acoustic characteristics of their speech. Do these adaptations specifically enhance phonetic contrasts or just result in more global enhancements? For phonetic contrasts, increased discriminability could be achieved by increasing between-category distance, reducing within-category dispersion or both. The LUCID corpus contains 32 iterations per consonant for each of 40 adults for the /s/-/∫/ and /p/-/b/ contrasts. Iterations were obtained via picture elicitation in a sentence context in two conditions: when asked to speak casually and clearly. Friction centroids were measured for /s/-/∫/ and voice onset times for /p/-/b/. For /s/-/∫/, although there was significantly greater distance between centroids in the clear speech condition, within-category dispersion did not differ across speaking styles and there was no significant increase in overall discriminability in the clear condition. For /p/-/b/, in the clear condition, there was a significan...
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