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Descripción
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| Amyotrohpic Lateral Sclerosis (ALS) is one of several neurodegenerative diseases which may benefit from speech processing for monitoring purposes. It is well known that ALS produces clear correlates in speech when the neuromotor units affecting oropharyngeal and mandibular muscles are suffering a specific deterioration. These correlates affect phonation, articulation, prosody and rhythm and can be precisely estimated using signal processing methods. This paper is oriented to give a measurement on how articulation is being affected by mapping the voiced fragments of running speech on the vowel triangle and proposing an asymmetry index which illustrates the degree of articulation deterioration. The index is based on the comparison of the actual vowel triangle gravity centre estimated from the patient?s utterance against a normative one, producing a deviation vector which illustrates the migration of the vowel space towards a neutral vowel near [æ]. An explanation for this fact may be found in the difficulties faced by the patient to activate precise articulation positions for the mandibular and hypoglossal muscles, and in the muscle atrophy in itself. Examples from a longitudinal study case are presented. | |
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Internacional
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Si |
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DOI
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Edición del Libro
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Editorial del Libro
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Firenze University Press |
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ISBN
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978-88-6655-469-1 |
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Serie
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Título del Libro
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Proc. of MAVEBA 2013 |
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Desde página
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27 |
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Hasta página
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30 |