Varley, Rosemary;
(2023)
Apraxia of speech: From psycholinguistic theory to the conceptualization and management of an impairment.
In: Guendouzi, Jackie and Lonck, Filip and Williams, Mandy J, (eds.)
The Routledge International Handbook of Psycholinguistic and Cognitive Processes.
(pp. 419-427).
Routledge: Taylor & Francis Group: New York, NY, US.
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Abstract
This chapter outlines the features of acquired apraxia of speech (AOS), together with the underlying neurobiology of the impairment. AOS is also distinguished from aphasic and dysarthric word production impairments. Two contrasting approaches to mechanisms of speech control are then described: one focuses on assembly of words from subcomponent units such as segments and syllables each time they are used; the second, a usage-based/frequentist account, proposes that complete motor plans for high-frequency words and utterances are stored. The implications of each approach for the conceptualization of the underlying impairment in AOS is explored; together with how they might inform assessment and management of the condition.
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