Maria Teresa Rosangela Lofredo BonattoPontifical Catholic University of São Paulo, Brazil
Title: Comparison of plosive sounds in monolingual and bilingual children, using the voice onset time acoustic parameter: Cases report
The study objective was to compare differences in production of plosive phonemes through Voice Onset Time (VOT) measurement in the speech of children monolingual in Brazilian Portuguese and children bilingual in Brazilian Portuguese and English. The sample consisted of three monolingual children and three bilingual children; average age was 7 years.Method: a speech emission was recorded for the investigation, which had the following vehicle phrase: “Diga ‘papa’ baixinho” (“Say ‘papa’ quietly”). Papa was then replaced by “baba,” “tata,” “dada,” “caca,” and “gaga.” The measurements of the acoustic signals were performed through broadband spectrograms, and VOT was descriptively analyzed for the non-voiced sounds [p, t, k] and voiced [b, d, g] plosive sounds.Results: monolingual children presented higher average VOT values for [p, t, k] compared to bilingual children. For the [b, d, g] sounds, monolingual children had lower average VOT values compared to bilingual children. Conclusion: in the comparison of VOT measures of the speech samples, the monolingual children of Brazilian Portuguese presented higher values for the non voiced ones and lower for the voiced ones in relation to the bilingual children of Brazilian Portuguese and English.
Keywords: Speech Acoustics; Child; Multilingualism; Voice
To be updated