Characterizing Articulation in Apraxic Speech Using Real-Time Magnetic Resonance Imaging Purpose Real-time magnetic resonance imaging (MRI) and accompanying analytical methods are shown to capture and quantify salient aspects of apraxic speech, substantiating and expanding upon evidence provided by clinical observation and acoustic and kinematic data. Analysis of apraxic speech errors within a dynamic systems framework is provided and the nature ... Research Note
Newly Published
Research Note  |   March 17, 2017
Characterizing Articulation in Apraxic Speech Using Real-Time Magnetic Resonance Imaging
 
Author Affiliations & Notes
  • Christina Hagedorn
    University of Southern California, Los Angeles
  • Michael Proctor
    Macquarie University, North Ryde, New South Wales, Australia
  • Louis Goldstein
    University of Southern California, Los Angeles
  • Stephen M. Wilson
    University of Arizona, Tucson
  • Bruce Miller
    University of California, San Francisco
  • Maria Luisa Gorno-Tempini
    University of California, San Francisco
  • Shrikanth S. Narayanan
    University of Southern California, Los Angeles
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Christina Hagedorn, who is now at College of Staten Island, City University of New York: christina.hagedorn@csi.cuny.edu
  • Editor and Associate Editor: Julie Liss
    Editor and Associate Editor: Julie Liss×
Article Information
Speech, Voice & Prosodic Disorders / Apraxia of Speech & Childhood Apraxia of Speech / Speech, Voice & Prosody / Newly Published / Research Note
Research Note   |   March 17, 2017
Characterizing Articulation in Apraxic Speech Using Real-Time Magnetic Resonance Imaging
Journal of Speech, Language, and Hearing Research, Newly Published. doi:10.1044/2016_JSLHR-S-15-0112
History: Received March 23, 2015 , Revised December 19, 2015 , Accepted July 15, 2016
 
Journal of Speech, Language, and Hearing Research, Newly Published. doi:10.1044/2016_JSLHR-S-15-0112
History: Received March 23, 2015; Revised December 19, 2015; Accepted July 15, 2016

Purpose Real-time magnetic resonance imaging (MRI) and accompanying analytical methods are shown to capture and quantify salient aspects of apraxic speech, substantiating and expanding upon evidence provided by clinical observation and acoustic and kinematic data. Analysis of apraxic speech errors within a dynamic systems framework is provided and the nature of pathomechanisms of apraxic speech discussed.

Method One adult male speaker with apraxia of speech was imaged using real-time MRI while producing spontaneous speech, repeated naming tasks, and self-paced repetition of word pairs designed to elicit speech errors. Articulatory data were analyzed, and speech errors were detected using time series reflecting articulatory activity in regions of interest.

Results Real-time MRI captured two types of apraxic gestural intrusion errors in a word pair repetition task. Gestural intrusion errors in nonrepetitive speech, multiple silent initiation gestures at the onset of speech, and covert (unphonated) articulation of entire monosyllabic words were also captured.

Conclusion Real-time MRI and accompanying analytical methods capture and quantify many features of apraxic speech that have been previously observed using other modalities while offering high spatial resolution. This patient's apraxia of speech affected the ability to select only the appropriate vocal tract gestures for a target utterance, suppressing others, and to coordinate them in time.

Acknowledgments
Research supported by NIH Grants R01 DC007124-01, awarded to Shrikanth S. Narayanan, and DC008780-05, awarded to Louis M. Goldstein.
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