Vocal tract aerodynamics in /aCa/ utterances: Measurements

Löfqvist, Anders; Koenig, Laura L.; McGowan, Richard S.

doi:10.1016/0167-6393(94)00049-g

Cited by 51 publications

(30 citation statements)

References 38 publications

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“…Laryngeal tension is thought to be increased preceding, during, and immediately after voiceless consonant production (Stevens, 1977;L€ ofqvist et al, 1989), which could contribute to a higher offset (before the consonant) and onset (after the consonant) RFF. Peak and minimum airflow values are known to increase during vowel offset and onset surrounding a voiceless consonant (Lofqvist and McGowan, 1992;Lofqvist et al, 1995), which could create a large Bernoulli force and cause rapid adduction of the vocal folds and thus a higher onset RFF (Ladefoged, 1967, p. 33). Finally, vocal fold abduction can occur during vowel offset prior to voiceless consonant production (Fukui and Hirose, 1983), which could potentially lead to lowered offset RFF.…”

Section: Introductionmentioning

confidence: 99%

Relative fundamental frequency during vocal onset and offset in older speakers with and without Parkinson's disease

Stepp

2013

The Journal of the Acoustical Society of America

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The relative fundamental frequency (RFF) surrounding production of a voiceless consonant has previously been shown to be lower in speakers with hypokinetic dysarthria and Parkinson's disease (PD) relative to age/sex matched controls. Here RFF was calculated in 32 speakers with PD without overt hypokinetic dysarthria and 32 age and sex matched controls to better understand the relationships between RFF and PD progression, medication status, and sex. Results showed that RFF was statistically significantly lower in individuals with PD compared with healthy age-matched controls and was statistically significantly lower in individuals diagnosed at least 5 yrs prior to experimentation relative to individuals recorded less than 5 yrs past diagnosis. Contrary to previous trends, no effect of medication was found. However, a statistically significant effect of sex on offset RFF was shown, with lower values in males relative to females. Future work examining the physiological bases of RFF is warranted.

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Section: Introductionmentioning

confidence: 99%

Relative fundamental frequency during vocal onset and offset in older speakers with and without Parkinson's disease

Stepp

2013

The Journal of the Acoustical Society of America

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“…Variations in the temporal programming of the oral and laryngeal gestures are used to produce contrasts of voicing and aspiration (e.g., . The phasing of the oral and laryngeal articulations is also important for the management of air pressure and air flow (e.g., Koenig et al, 1995;Löfqvist et al, 1995;Löfqvist and McGowan, 1992;McGowan et al, 1995). Here, an increase in oral air pressure is made to drive the noise source.…”

Section: Introductionmentioning

confidence: 99%

Interarticulator programming in VCV sequences: Lip and tongue movements

Löfqvist

Gracco

1999

The Journal of the Acoustical Society of America

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This study examined the temporal phasing of tongue and lip movements in vowel-consonant-vowel sequences where the consonant is a bilabial stop consonant /p, b/ and the vowels one of /i, a, u/; only asymmetrical vowel contexts were included in the analysis. Four subjects participated. Articulatory movements were recorded using a magnetometer system. The onset of the tongue movement from the first to the second vowel almost always occurred before the oral closure. Most of the tongue movement trajectory from the first to the second vowel took place during the oral closure for the stop. For all subjects, the onset of the tongue movement occurred earlier with respect to the onset of the lip closing movement as the tongue movement trajectory increased. The influence of consonant voicing and vowel context on interarticulator timing and tongue movement kinematics varied across subjects. Overall, the results are compatible with the hypothesis that there is a temporal window before the oral closure for the stop during which the tongue movement can start. A very early onset of the tongue movement relative to the stop closure together with an extensive movement before the closure would most likely produce an extra vowel sound before the closure.

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“…Voice onset time (VOT) plays a key role in both speech production and perception and has been the focus of a number of investigations in speech perception [11,14,16,17], and speech production [2,3,4,6,7,8,9,15]. Furthermore, this temporal parameter has also been investigated in a range of motor speech disorders as it provides information on disruptions to the coordination between laryngeal and supralaryngeal mechanisms which govern the integrity of this speech parameter [1,5], or how individuals with motor speech disorders compensate for their underlying motor deficits [1].…”

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confidence: 99%

Patterns of variability in voice onset time: a developmental study of motor speech skills in humans

Whiteside

Dobbin

Henry

2003

Neuroscience Letters

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This study investigated the developmental patterns of variability in the speech parameter voice onset time (VOT) in forty six children. Five groups of children participated in the study as follows: i) Group 1 -aged 5 years 8 months (n=6); ii) Group 2 -7 years 10 months (n=10); iii) Group 3 -9 years 10 months (n=10); iv) Group 4 -11 years 10 months (n=10), and v) Group 5 -13 years 2 months (n=10). Coefficient of variation (COV) values were examined for the VOT values of both "voiceless" (/p t k/) and "voiced" (/b d g/) plosives to determine patterns of variability. Significant effects of age were revealed for both the voiceless and voiced plosives, and levels of variability leveled off for Group 4. The data suggest that although variability in VOT decreases with age, the presence of residual variability may be a prerequisite for the further refinement of motor speech skills.

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Vocal tract aerodynamics in /aCa/ utterances: Measurements

Cited by 51 publications

References 38 publications

Relative fundamental frequency during vocal onset and offset in older speakers with and without Parkinson's disease

Relative fundamental frequency during vocal onset and offset in older speakers with and without Parkinson's disease

Interarticulator programming in VCV sequences: Lip and tongue movements

Patterns of variability in voice onset time: a developmental study of motor speech skills in humans

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