Stacey Sangtian1, Yuan Wang2, Julius Fridriksson3, Roozbeh Behroozmand4. 1. Speech Neuroscience Lab, Department of Communication Sciences and Disorders, Arnold School of Public Health, University of South Carolina, 915 Greene Street, Columbia, SC 29208, United States of America. 2. Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, 915 Greene Street, Columbia, SC 29208, United States of America. 3. Aphasia Lab, Department of Communication Sciences and Disorders, Arnold School of Public Health, University of South Carolina, 915 Greene St., Columbia, SC 29208, United States of America; Center for the Study of Aphasia Recovery (C-STAR), Department of Communication Sciences and Disorders, Arnold School of Public Health, University of South Carolina, 915 Greene St., Columbia, SC 29208, United States of America. 4. Speech Neuroscience Lab, Department of Communication Sciences and Disorders, Arnold School of Public Health, University of South Carolina, 915 Greene Street, Columbia, SC 29208, United States of America. Electronic address: r-behroozmand@sc.edu.
Abstract
INTRODUCTION: The present study investigated how damage to left-hemisphere brain networks affects the ability for speech auditory feedback error detection and motor correction in post-stroke aphasia. METHODS: 34 individuals with left-hemisphere stroke and 25 neurologically intact age-matched control participants performed two randomized experimental tasks in which their online speech auditory feedback was altered using externally induced pitch-shift stimuli: 1) vocalization of a steady speech vowel sound /a/, and 2) listening to the playback of the same self-produced vowel vocalizations. Randomized control condition trials were interleaved in between vocalization and listening tasks where no pitch-shift stimuli were delivered. Following each trial, participants pressed a button to indicate whether they detected a pitch-shift error in their speech auditory feedback during vocalization and listening tasks. RESULTS: Our data analysis revealed that speech auditory feedback error detection accuracy rate was significantly lower in the stroke compared with control participants, irrespective of the experimental task (i.e. vocalization vs. listening) and trial condition (i.e. pitch-shifted vs. no-pitch-shift). We found that this effect was associated with the reduced magnitude of speech compensation in the early phase of responses at 150-200 ms following the onset of pitch-shift stimuli in stroke participants. In addition, motor speech compensation deficit in the stroke group was correlated with lower scores on speech repetition tasks as an index of language impairment resulting from aphasia. CONCLUSIONS: These findings provide evidence that left-hemisphere stroke is associated with impaired speech auditory feedback error processing, and such deficits account for specific aspects of language impairment in aphasia.
INTRODUCTION: The present study investigated how damage to left-hemisphere brain networks affects the ability for speech auditory feedback error detection and motor correction in post-stroke aphasia. METHODS: 34 individuals with left-hemisphere stroke and 25 neurologically intact age-matched control participants performed two randomized experimental tasks in which their online speech auditory feedback was altered using externally induced pitch-shift stimuli: 1) vocalization of a steady speech vowel sound /a/, and 2) listening to the playback of the same self-produced vowel vocalizations. Randomized control condition trials were interleaved in between vocalization and listening tasks where no pitch-shift stimuli were delivered. Following each trial, participants pressed a button to indicate whether they detected a pitch-shift error in their speech auditory feedback during vocalization and listening tasks. RESULTS: Our data analysis revealed that speech auditory feedback error detection accuracy rate was significantly lower in the stroke compared with control participants, irrespective of the experimental task (i.e. vocalization vs. listening) and trial condition (i.e. pitch-shifted vs. no-pitch-shift). We found that this effect was associated with the reduced magnitude of speech compensation in the early phase of responses at 150-200 ms following the onset of pitch-shift stimuli in stroke participants. In addition, motor speech compensation deficit in the stroke group was correlated with lower scores on speech repetition tasks as an index of language impairment resulting from aphasia. CONCLUSIONS: These findings provide evidence that left-hemisphere stroke is associated with impaired speech auditory feedback error processing, and such deficits account for specific aspects of language impairment in aphasia.
Authors: Edward F Chang; Caroline A Niziolek; Robert T Knight; Srikantan S Nagarajan; John F Houde Journal: Proc Natl Acad Sci U S A Date: 2013-01-23 Impact factor: 11.205
Authors: Roozbeh Behroozmand; Hiroyuki Oya; Kirill V Nourski; Hiroto Kawasaki; Charles R Larson; John F Brugge; Matthew A Howard; Jeremy D W Greenlee Journal: J Neurosci Date: 2016-02-17 Impact factor: 6.167
Authors: Jeremy D W Greenlee; Roozbeh Behroozmand; Charles R Larson; Adam W Jackson; Fangxiang Chen; Daniel R Hansen; Hiroyuki Oya; Hiroto Kawasaki; Matthew A Howard Journal: PLoS One Date: 2013-04-08 Impact factor: 3.240