School of Languages and Linguistics - Research Publications
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ItemNasal aerodynamics and coarticulation in Bininj Kunwok: Smoothing Spline Analysis of Variance(ASSTA, 2016-12-06)Nasal phonemes are well represented within the lexicon of BininjKunwok.1 Thisstudyexaminesintervocalic,wordmedial nasals and reports patterns of coarticulation using a Smooth- ing Spline Analysis of Variance (SSANOVA). This allows for detailed comparisons of peak nasal airflow across six female speakers of the language. Results show that in a VNV sequence there is very little anticipatory vowel nasalisation and greater carryover into a following vowel. The maximum peak nasal flow is delayed for coronals when compared to the onset of oral closure in the nasal, indicating a delayed velum opening gesture. The velar place of articulation is the exception to this pattern with some limited anticipatory nasalisation. The SSANOVA has shown to be an appropriate technique for quantifying these patterns and dynamic speech data in general.
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ItemProsodically Conditioned Consonant Duration in Djambarrpuyŋu.(SAGE Publications, 2019-03-01)Cross-linguistically, segments typically lengthen because of proximity to prosodic events such as intonational phrase or phonological phrase boundaries, a phrasal accent, or due to lexical stress. Australian Indigenous languages have been claimed to operate somewhat differently in terms of prosodically conditioned consonant lengthening and strengthening. Consonants have been found to lengthen after a vowel bearing a phrasal pitch accent. It is further claimed that this post-tonic position is a position of prosodic strength in Australian languages. In this study, we investigate the effects of proximity to a phrasal pitch accent and prosodic constituent boundaries on the duration of stop and nasal consonants in words of varying lengths in Djambarrpuyŋu, an Australian Indigenous language spoken in northeast Arnhem Land, Northern Territory, Australia. Our results suggest that the post-tonic consonant position does not condition longer consonant duration compared with other word-medial consonants, with one exception: Intervocalic post-tonic consonants in disyllabic words are significantly longer than word-medial consonants elsewhere. Therefore, it appears that polysyllabic shortening has a strong effect on segment duration in these data. Word-initial position did not condition longer consonant duration than word-medial position. Further, initial consonants in higher-level prosodic domains had shorter consonant duration compared with domain-medial word-initial consonants. By contrast, domain-final lengthening was observed in our data, with word-final nasals preceding a pause found to be significantly longer than all other consonants. Taken together, these findings for Djambarrpuyŋu suggest that, unlike other Australian languages, post-tonic lengthening is not a cue to prosodic prominence, whereas prosodic domain-initial and -final duration patterns of consonants are like those that have been observed in other languages of the world.
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ItemJapanese Vowel Devoicing Modulates Perceptual Epenthesis(Australian Speech Science and Technology Association, 2018)
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ItemPhrasing and constituent boundaries in Lifou French(Australasian Speech Science and Technology Australia (ASSTA), 2019)
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ItemPredictability, Word Frequency and Japanese Perceptual Epenthesis(Australasian Speech Science and Technology Association Inc., 2019)Speakers typically invest less effort in the articulation of sounds and words that are highly predictable from their contexts. Recent research reveals a perceptual corollary to this behaviour, showing that listeners pay less attention to acoustic signal in predictable contexts. The present paper expands on this finding by testing the acceptability and discriminability of sequences of speech with varying levels of predictability. Stimuli are contrast pairs and are either phonotactically attested or else contain an illicit nonhomorganic consonant cluster. Such clusters violate Japanese phonotactics and have been found to elicit perceptual epenthesis in Japanese listeners. The results show that unattested consonant clusters are perceived as more acceptable in high-frequency sequences than in low-frequency sequences.
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ItemAcoustic correlates of lexical stress in Wubuy(Australasian Speech Science and Technology Association Inc., 2019)We examined the acoustic correlates of lexical stress in the non-Pama-Nyungan language Wubuy (Northern Territory, Australia). We tested two hypotheses about stress: that stress is determined by (1) a combination of syllable position in prosodic word and quantity sensitivity, or (2) by position alone. To test these hypotheses, we elicited trisyllabic noun roots differing in position of heavy syllables in frame-final environments from 3 speakers. We found that both position and predicted stress based on prior phonological descriptions could account for many correlates (segment and syllable duration, f0, intensity, vowel formants) although overall syllable position appeared to account for more of the variance.
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ItemProsodic marking of focus in Nafsan(Australasian Speech Science and Technology Association, 2019)Languages use a variety of means to realise informational structure categories like topicalisation and focus. The interaction between prosody and focus realisation strategies was examined in Nafsan, a Southern Oceanic language of Vanuatu, in a series of tasks that were designed to explore prosodic realisation of informational and contrastive focus on nouns that were subjects or objects in mini-dialogues where word-order was manipulated. All speakers produced utterance-initial or utterance-final focal elements with a major pitch movement associated with the focused noun (subject or object). Focused nouns were also realised with a wider pitch and often realised in their own prosodic phrase compared to the same item in non-focal contexts. There was also significant syllable lengthening at the right edge of in-focus words. In utterance-initial contexts, post-focal material in Nafsan was almost always produced in a relatively compressed pitch range and there was evidence of de-phrasing of non-focal nouns regardless of utterance position, suggesting prosodic phrasing patterns similar to other languages with edge-marking prominence.
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ItemThe secondary roles of amplitude and F0 in the perception of word-initial geminates in Kelantan Malay(Australasian Speech Science and Technology Australia (ASSTA), 2019)This study examines the extent to which amplitude and F0 play secondary roles in perceptually cueing the word-initial singleton/geminate consonant contrast in Kelantan Malay (KM). Three voiceless stop word-pairs produced in isolation, i.e. utterance-initial position, were chosen for manipulation in three perception experiments involving KM native listeners. Results show that amplitude and F0 have limited perceptual functions on their own, although the combined values of the two parameters do have some effect on the perception of the consonant contrast. These results are expected for the utterance-initial voiceless stop pairs given the absence of closure duration information as a perceptual cue in this context. The findings support the view that the consonant length distinction in word-initial position, particularly for voiceless stops, can be potentially cued by a set of secondary parameters, e.g. amplitude and F0, alongside the primary acoustic parameter of closure duration.
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ItemAcoustic analysis of the effects of 24 hours of sustained wakefulness(Australasian Speech Science and Technology Association, 2010)The effect of 24 hours of sustained wakefulness on the speech of healthy adults is poorly documented. Therefore, speech samples were systematically acquired (e.g., every four hours) from 18 healthy adults over 24 hours. Stimuli included automated and extemporaneous tasks, sustained vowel and a read passage. Measures of timing and frequency were derived acoustically using Praat and significant changes were observed on all tasks. The effect of fatigue on speech was found to be strongest just before dawn (after 22 hours). Key features of timing (e.g., mean pause length), frequency (e.g., F4 variation) and power (alpha ratio) changed as a function of increasing levels of fatigue. Index Terms: fatigue, voice, tiredness, clinical marker
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ItemNo Preview AvailableAcoustic analysis of the effects of sustained wakefulness on speech(ACOUSTICAL SOC AMER AMER INST PHYSICS, 2010-12)Exposing healthy adults to extended periods of wakefulness is known to induce changes in psychomotor functioning [Maruff et al. (2005). J. Sleep Res. 14, 21-27]. The effect of fatigue on speech is less well understood. To date, no studies have examined the pitch and timing of neurologically healthy individuals over 24 h of sustained wakefulness. Therefore, speech samples were systematically acquired (e.g., every 4 h) from 18 healthy adults over 24 h. Stimuli included automated and extemporaneous speech tasks, sustained vowel, and a read passage. Measures of timing, frequency and spectral energy were derived acoustically using PRAAT and significant changes were observed on all tasks. The effect of fatigue on speech was found to be strongest just before dawn (after 22 h). Specifically, total speech time, mean pause length, and total signal time all increased as a function of increasing levels of fatigue on the reading tasks; percentage pause and mean pause length decreased on the counting task; F4 variation decreased on the sustained vowel tasks /a:/; and alpha ratio increased on the extemporaneous speech tasks. These findings suggest that acoustic methodologies provide objective data on central nervous system functioning and that changes in speech production occur in healthy adults after just 24 h of sustained wakefulness.
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