Abstract
A stochastic analysis using aerodynamic and temporal variables is presented to explain tap/trill variation in Spanish codas. Simultaneous intraoral pressure (Po), translingual flow (F) and acoustic signals were obtained for two native speakers of Peninsular Spanish performing a rate-controlled reiterative task. Data were analyzed using linear mixed effects models fitted with random effects for speaker and repetition. The results show that tongue height and tongue anteriority of the preceding vowel affect the timing and aerodynamic parameters of the rhotic onset gesture, but the phonological specifications of the following consonants do not. Continuous variables were fit into a Bayesian logit regression model using noninformative priors which shows that tap/trill variation in coda can be predicted in part from aerodynamic and temporal parameters. Such a proposal obviates the need to resort to positional constraints to explain tap/trill variation in codas.
Highlights
A stochastic analysis using aerodynamic and temporal variables is presented to explain tap/trill variation in Spanish codas
Aerodynamic instrumentation was chosen due to the high aerodynamic setting for rhotics and to avoid perturbation of the tongue tip during articulation, which may occur with other methods such as EMA (Electromagnetic Midsagittal Articulography) or EMG
Tongue anteriority for the preceding vowel has a main effect on the latency from the initiation of phonation to the onset of the tongue tip gesture (χ2[1, N = 865] = 864, p < .001), as does tongue height (χ2[1, N = 865] = 864, p < .0001), but not their interaction (χ2[1, N = 865] = 864, p = 1.0)
Summary
A stochastic analysis using aerodynamic and temporal variables is presented to explain tap/trill variation in Spanish codas. Continuous variables were fit into a Bayesian logit regression model using noninformative priors which shows that tap/trill variation in coda can be predicted in part from aerodynamic and temporal parameters. Whereas the simple tap [ɾ] requires lingual muscular control to carry out the tongue tip gesture, trill instantiation and maintenance depends on the antagonistic relationship between torsional force of the tongue mass and aerodynamic factors (Barry, 1997; Catford, 1977; Ladefoged & Maddieson, 1996; Recasens, 1991; Spajić, Ladefoged, & Bhaskararao, 1996; Solé, 2002). She showed that gradual reductions in oropharyngeal pressure extinguished voiced trills earlier than voiceless trills and the window of permissible pressure parameters for trills is narrower than that of fricatives, suggesting that voiceless trills tend to be more impervious to changes in aerodynamic conditions than voiced trills
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