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    ABSTRACT: The work of Frederic L. Darley and his colleagues has done much to shape approaches to the clinical diagnosis and understanding of the dysarthrias and the scientific study of speech production. From the perspective of the speech pathologist and the perspective of the speech scientist, this paper examines Darley"s contributions to the clinical diagnosis and management of the dysarthrias, to the localisation and diagnosis of neurologic disease, to descriptions of the perceptual representations of disordered speech, and to efforts to integrate information about disordered neural control of speech with information about the normal neural control of speech. Gaps in knowledge and directions for future work in each of these areas are also discussed.
    Aphasiology 02/2001; 15(3):275-289. DOI:10.1080/02687040042000269 · 1.53 Impact Factor
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    ABSTRACT: Twenty speech-language pathologists judged the adequacy of oral diadochokinetic performances by ten normal young adult speakers, ten normal geriatric speakers, and four dysarthric speakers (foils) for the purpose of investigating age-related changes in speech. Listeners rated each speaker according to 11 perceptual dimensions. Significant differences in ratings were found among the three subject groups for 10 of the 11 perceptual dimensions. The performances of elderly normal adult speakers were rated farther from the "normal" endpoint of a seven-point continuum than those of the young normal adults. The listeners also reported lesser degrees of confidence in their ratings of the geriatrics in comparison with both young adult and dysarthric groups. Perceptual characteristics associated with oral diadochokinetic performance appear to be altered with advanced age. Further analysis of clinicians' judgments suggest support for Ryan and Burk's (1974) proposal that the speech of aged adults may fall at the "mild end of a dysarthric continuum." Results emphasized the need for development of clinical standards of speech normality for the geriatric population.
    Journal of Communication Disorders 09/1987; 20(4):339-51. DOI:10.1016/0021-9924(87)90015-3 · 1.45 Impact Factor
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    ABSTRACT: Bilabial, alveolar and velar sounds are produced at different locations around the oral cavity. fMRI was used to localize cortical representation of articulation in seven healthy subjects during repetitive lip and vertical tongue movements as well as repetitive articulation of /pa/ (bilabial), /ta/ (alveolar), /ka/ (velar consonants) and a combination of all three in /pataka/. Centers of gravity (COG) analysis of fMRI activation in the primary motor (M1) and sensory cortex (S1) revealed /pa/- adjacent to lip representation and /ta/- articulation to tongue representation. The articulation of /pataka/ showed an activation pattern with a combination of the two M1/S1-components and additional activation in the supplementary motor area.
    Neuroreport 10/2000; 11(13):2985-9. DOI:10.1097/00001756-200009110-00032 · 1.52 Impact Factor
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