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What is apraxia of speech?

Coarticulation in apraxia of speech: an acoustic study of non-words Authors : Sandra P Whiteside and Rosemary A. Varley. What is apraxia of speech?.

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What is apraxia of speech?

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  1. Coarticulation in apraxia of speech: an acoustic study of non-wordsAuthors : Sandra P Whiteside and Rosemary A. Varley

  2. What is apraxia of speech? • Apraxia of speech is a motor speech disorder which results from lesion of the language dominant hemisphere in the region of frontal pre-motor cortex (Whiteside, & Varley, 1998). • In other words, apraxia of speech is a motor speech disorder where there is a disconnection between the brain and the articulators.

  3. Purpose • Investigate the coarticulatory and temporal patterns of single syllabic non-words produced by a normal speaker and a speaker with apraxia of speech . • Coarticulation: the concept that the articulators are constantly moving into position for other segments over a stretch of speech (Articulatory and Phonological Impairments: A Clinical Focus).

  4. Main Focus • Aim to see whether there are reduced coarticulation patterns in the production of non-word syllables.

  5. Subjects • 2 subjects : • AD : severe apraxia of speech • RM: control subject with normal speech - Both subjects were 48 year old police officers - Both subjects were from South Yorkshire * Investigators wanted subjects to have similar regional accents - Both subjects were from similar socioeconomic statuses

  6. Data • Subjects were asked to repeat 22 monosyllabic CV or CVC non-words following an experimenter. • Speech stimuli were recorded for both subjects. • Once plotted, the data showed the second subject had stepper slopes in all cases compared to the first subject. • Researchers linked that to more coarticulation for the control speaker and reduced articulation for the speaker with apraxia. • Additional data was collected on coarticulation with schwa patterns, and it replicated the same results from the previous findings.

  7. Results • Reduced coarticulation and lengthened durational patterns in the data of the speaker with apraxia of speech.

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