Abstract
The ability of six normal four‐year‐old children to compensate in their speech production for reduction of two types of feedback was examined. Subjects recorded repetitions of a carrier phrase containing a target word with one of three vowels (/i/, /l/, /æ/) in mixed, randomly selected sequences in four conditions: normal, masking noise, biteblock, biteblock plus masking. The ability of each child to compensate was measured by comparison of the first three vowel formants of each test condition with those of the normal condition. Data from three subjects have been acoustically analyzed using LPC techniques. Preliminary results suggest that while four‐year‐old children more easily over‐come effects of noise, they do not fully compensate for presence of a biteblock. Biteblock effects appear to vary depending upon vowel height of the target. F2 values are lowered in biteblock production of /i/, whereas F1 values are lowered in /æ/. Formant values for midvowel /l/ are less affected. Considerable individual differences are seen in ability to compensate for feedback reduction. [Work supported by NINCDS Grant DC00121‐29.]
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