Velar movements during speech in a patient with apraxia of speech

Itoh, Motonobu; Sasanuma, Sumiko; Ushijima, Tatsujiro

doi:10.1016/0093-934x(79)90019-1

Cited by 107 publications

(27 citation statements)

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“…What is consistent, however, is that regardless of how the tokens deviating from the target are produced, the preference for the stable modes of in-phase and 1:1 coordination among vocal tract gestures is exhibited. The token-to-token variability exhibited by our patient is consistent with results of past studies describing variability in articulator kinematics (Itoh et al, 1979) and timing relationships among articulators (Itoh, Sasanuma, Hirose, Yoshioka, & Ushijima, 1980) as well as variability in linguo-palatal contact patterns (Hardcastle, 1987) and in abductory and adductory laryngeal gestures (Hoole, Schroter-Morasch, & Ziegler, 1997). As to the mechanism underlying AOS, our results are consistent with the hypothesis that the syndrome affects the formation of "molecular units" consisting of temporally and spatially coordinated articulatory gestures (Browman & Goldstein, 1992;Staiger et al, 2012).…”

Section: Discussionsupporting

confidence: 81%

“…Apraxic speech articulation and articulatory coordination have long been areas of interest among researchers and have been investigated kinematically (Bartle-Meyer, Goozée, Murdoch, & Green, 2009;Itoh, Sasanuma, & Ushijima, 1979) and using electropalatography (EPG; BartleMeyer, Murdoch, & Goozée, 2009;Hardcastle, Gibbon, & Jones, 1991;Howard & Varley, 1995). Although these modalities provide useful information about articulatory movement and contact patterns in apraxic speech, they are invasive by nature and do not provide the researcher with a dynamic view of the entire vocal tract during speech.…”

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confidence: 99%

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Characterizing Articulation in Apraxic Speech Using Real-Time Magnetic Resonance Imaging

Hagedorn

Proctor

Goldstein

et al. 2017

J Speech Lang Hear Res

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Purpose: Real-time magnetic resonance imaging (MRI) and accompanying analytical methods are shown to capture and quantify salient aspects of apraxic speech, substantiating and expanding upon evidence provided by clinical observation and acoustic and kinematic data. Analysis of apraxic speech errors within a dynamic systems framework is provided and the nature of pathomechanisms of apraxic speech discussed. Method: One adult male speaker with apraxia of speech was imaged using real-time MRI while producing spontaneous speech, repeated naming tasks, and self-paced repetition of word pairs designed to elicit speech errors. Articulatory data were analyzed, and speech errors were detected using time series reflecting articulatory activity in regions of interest.Results: Real-time MRI captured two types of apraxic gestural intrusion errors in a word pair repetition task. Gestural intrusion errors in nonrepetitive speech, multiple silent initiation gestures at the onset of speech, and covert (unphonated) articulation of entire monosyllabic words were also captured. Conclusion: Real-time MRI and accompanying analytical methods capture and quantify many features of apraxic speech that have been previously observed using other modalities while offering high spatial resolution. This patient's apraxia of speech affected the ability to select only the appropriate vocal tract gestures for a target utterance, suppressing others, and to coordinate them in time.

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Section: Discussionsupporting

confidence: 81%

mentioning

confidence: 99%

Characterizing Articulation in Apraxic Speech Using Real-Time Magnetic Resonance Imaging

Hagedorn

Proctor

Goldstein

et al. 2017

J Speech Lang Hear Res

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“…Examples of speech characteristics in AOS include inconsistent and variable articulatory movements (Itoh, Sasanuma, & Ushijima, 1979;Ziegler & von Cramon, 1986a), a general slowed rate of speech with resulting prolongations of transitions, segments and intersyllabic pauses (Kent & Rosenbek, 1983;Wambaugh, Duffy, McNeil, Robin, & Rogers, 2006), increased word and vowel duration patterns (Collins, Rosenbek, & Wertz, 1983;Kent & Rosenbek, 1983;Skenes, 1987;Varley, Whiteside, & Luff, 1999), voicing errors (Freeman, Sands, & Harris, 1978;Kent & Rosenbek, 1983), and segmental errors in the form of perceived phonemic ''substitutions'' and phonetic ''distortions'' (Kent & Rosenbek, 1983;Wambaugh et al, 2006). Reduced coarticulation has also been observed in speakers with AOS (Southwood, Dagenais, Sutphin, & Mertz Garcia, 1997;Whiteside & Varley, 1998b, 1998cZiegler & von Cramon, 1985, 1986b.…”

Section: Acquired Apraxia Of Speech (Aos)mentioning

confidence: 99%

An acoustic study of vowels and coarticulation as a function of utterance type: A case of acquired apraxia of speech

Whiteside¹,

Grobler²,

Windsor³

et al. 2010

Journal of Neurolinguistics

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“…Studies of patients with anterior lesions show various deficits in temporal coordination in nasal consonant production including marked variability in velar gestures affecting velum height and slope of velar lowering (Itoh, Sasanuma, and Ushijima, 1979;Itoh, Sasanuma, Hirose, Yoshioka and Ushijima, 1980), premature occlusion of the velar port (Ziegler and Cramon, 1985), and inappropriate velar lowering and a high degree of velar movement variation (Katz, Machetanz, Orth, and Schonle, 1990).…”

Section: Introductionmentioning

confidence: 99%

Nasal consonant production in Broca’s and Wernicke’s aphasics: Speech deficits and neuroanatomical correlates

et al. 2007

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The present study investigated the articulatory implementation deficits of Broca's and Wernicke's aphasics and their potential neuroanatomical correlates. Five Broca's aphasics, two Wernicke's aphasics, and four age-matched normal speakers produced consonant-vowel-(consonant) real word tokens consisting of [m, n] followed by [i, e, a, o, u]. Three acoustic measures were analyzed corresponding to different properties of articulatory implementation: murmur duration (a measure of timing), amplitude of the first harmonic at consonantal release (a measure of articulatory coordination), and murmur amplitude over time (a measure of laryngeal control). Results showed that Broca's aphasics displayed impairments in all of these parameters, whereas Wernicke's aphasics only exhibited greater variability in the production of two of the parameters. The lesion extent data showed that damage in either Broca's area or the insula cortex was not predictive of the severity of the speech output impairment. Instead, lesions in the upper and lower motor face areas and the supplementary motor area resulted in the most severe implementation impairments. For the Wernicke's aphasics, the posterior areas (superior marginal gyrus, parietal, and sensory) appear to be involved in the retrieval and encoding of lexical forms for speech production, resulting in increased variability in speech production.

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Velar movements during speech in a patient with apraxia of speech

Cited by 107 publications

References 12 publications

Characterizing Articulation in Apraxic Speech Using Real-Time Magnetic Resonance Imaging

Characterizing Articulation in Apraxic Speech Using Real-Time Magnetic Resonance Imaging

An acoustic study of vowels and coarticulation as a function of utterance type: A case of acquired apraxia of speech

Nasal consonant production in Broca’s and Wernicke’s aphasics: Speech deficits and neuroanatomical correlates

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