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Encoding, memory, and transcoding deficits in Childhood Apraxia of Speech
Lawrence D Shriberg1, Heather L Lohmeier, Edythe A Strand
1Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA. shriberg@waisman.wisc.edu
Clinical Linguistics & Phonetics
|April 12, 2012
Summary
Childhood Apraxia of Speech (CAS) involves more than just speech planning deficits. Research shows individuals with CAS also experience challenges in auditory encoding, memory, and transcoding processes.
Area of Science:
- Speech-Language Pathology
- Neurodevelopmental Disorders
- Auditory Processing
Background:
- Childhood Apraxia of Speech (CAS) is a complex disorder affecting speech production.
- A key debate concerns whether CAS primarily involves speech planning (transcoding) deficits or also impacts auditory perception and memory.
Purpose of the Study:
- To investigate the nature of speech processing deficits in children with CAS.
- To determine if CAS affects auditory-perceptual encoding and memory, in addition to transcoding.
Main Methods:
- Utilized the Syllable Repetition Task (SRT) with 369 participants across four groups: typical speech-language, speech delay-typical language, speech delay-language impairment, and idiopathic/neurogenetic CAS.
- Analyzed SRT competence, encoding, memory, and transcoding scores.
Main Results:
- Participants with CAS demonstrated significantly lower scores in SRT competence, encoding, memory, and transcoding compared to control groups.
- Individuals with CAS were 8.3 times more likely to exhibit transcoding scores below 80%.
Conclusions:
- Speakers with CAS exhibit speech processing deficits across encoding, memory, and transcoding domains.
- The SRT shows moderate accuracy in identifying transcoding deficits, a hallmark of CAS.
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