engleski

Ultrasound study: difference in coarticulation resistance between Croatian fricatives /s/ and /ʃ/

The paper presents the results of the ultrasound methodology used in the study of coarticulatory effect of the neighboring vowel context on the Croatian fricatives /s/ and /ʃ/ for each vowel context separately. It is hypothesized that /s/ will be more variable than /ʃ/ and the vowels will have greater coarticulatory influence on /s/ than on /ʃ/. For both fricatives there will be more influence and variability of the tongue position of the back vowels than the front vowels. The hypotheses are based on the Degree of the Articulatory Constraint Model (DAC, Recasens. Pallares and Fontdevilla 1997). It is also assumed that the tongue position for fricatives will be more sensitive in carry-over than in anticipatory coarticulation. The speech material was recorded via two simultaneous channels (acoustic and ultrasound) with head stabilization (PHILIP) and speaker stabilization (S.O.S), and a part of the Croatian ultrasound Corps (HULK) (Carović, 2014a). Six speakers (3 male and 3 female) with healthy speaking and hearing status were used for recording purposes. Ultrasound images were annotated in monosyllabic non-words. The results were presented by means of visual examination and two quantified measures: tongue Center of Gravity index and variability index. This kind of basic research can provide important information about the variability of the fricatives /s/ and /ʃ / in Croatian, in diagnostics and in rehabilitation of speech, e.g. in teaching Croatian as L2.00000

phonetics ; ultrasound tongue imaging ; coarticulation ; speech production measurement

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