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Sensorimotor impairment of speech auditory feedback processing in aphasia
Roozbeh Behroozmand1, Lorelei Phillip2, Karim Johari1
1Speech Neuroscience Lab, Department of Communication Sciences and Disorders, University of South Carolina, 915 Greene Street, Columbia, SC 29208, USA.
Neuroimage
|October 13, 2017
Summary
Patients with post-stroke aphasia show impaired speech sensorimotor processing. Damage to auditory and frontal brain regions affects their ability to adapt to altered auditory feedback, impacting speech error correction and repetition skills.
Area of Science:
- Neuroscience
- Speech-Language Pathology
Background:
- Speech sensorimotor processing relies on auditory-motor integration.
- Aphasia, often caused by stroke, impairs communication and can affect speech production.
- Altered auditory feedback (AAF) is a tool to probe speech sensorimotor control.
Purpose of the Study:
- To investigate the brain networks involved in speech sensorimotor processing in post-stroke aphasia.
- To examine the relationship between cortical damage and speech sensorimotor deficits using AAF.
- To identify specific brain regions predicting deficits in processing auditory feedback during speech.
Main Methods:
- Studied 16 patients with aphasia and 16 controls using an altered auditory feedback (AAF) paradigm.
- Participants produced vowel sounds with real-time pitch-shifted auditory feedback.
- Combined lesion-symptom mapping with behavioral testing to analyze speech responses to AAF.
Main Results:
- Compensatory speech responses to AAF were significantly reduced in individuals with aphasia.
- Diminished AAF responses correlated with lower speech repetition scores in the aphasia group.
- Lesion mapping linked early AAF response deficits to auditory cortex damage (superior/middle temporal gyrus) and later phases to frontal regions (inferior frontal gyrus, supramarginal gyrus).
Conclusions:
- Damage to auditory, motor, and integration networks impairs speech sensorimotor function and error processing in aphasia.
- Specific temporal components of AAF responses are linked to distinct brain regions, highlighting a sensorimotor integration network.
- This network is crucial for speech processing and may underlie specific deficits like repetition difficulties in aphasia.
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