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As predicted, the infants discriminated d/ga3 from da1 following /al/ but not /ar/ conversely, they discriminated d/ga3 from ga5 following /ar/ but not /al/. Following habituation to either ald/ga3 or ard/ga3, infants heard either the corresponding ga5 or da1 disyllable. We obtained similar results with 4-month-old infants. In the discrimination test, they discriminated d/ga3 from da1 preceded by /al/ but not /ar/ compatibly, they discriminated d/ga3 readily from ga5 preceded by /ar/ but poorly preceded by /al/. In the identification test, adults had identified item ga5 as “ga,” and da1 as “da,” following both /al/ and /ar/, whereas they identified the crucial item d/ga3 predominantly as “ga” after /al/ but as “da” after /ar/. Three equidistant items from a /da/–/ga/ continuum were used preceded by /al/ and /ar/. We replicated this finding and extended it to a signal-detection test of discrimination with adults, using triads of disyllables. That is, some of the fronting information in the temporal domain of the stop is perceptually attributed to /l/ ( Mann, 1980). Perception by mature listeners shows a complementary sensitivity-when a synthetic /da/–/ga/ continuum is preceded by either /al/ or /ar/, adults hear more /g/s following /l/ rather than /r/.
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For example, due to carryover coarticulation, the front tongue-tip position for /l/ results in more fronted tongue-body contact for a /g/ preceded by /l/ than for a /g/ preceded by /r/. Accordingly, the articulatory and acoustic properties of the speech signal during the time frame traditionally identified with a given phoneme are highly context-sensitive. Phonetic segments are coarticulated in speech.