Speech Adaptation to Kinematic Recording Sensors: Perceptual and Acoustic Findings Purpose This study used perceptual and acoustic measures to examine the time course of speech adaptation after the attachment of electromagnetic sensor coils to the tongue, lips, and jaw. Method Twenty native English speakers read aloud stimulus sentences before the attachment of the sensors, immediately after attachment, and ... Research Note
Research Note  |   March 15, 2018
Speech Adaptation to Kinematic Recording Sensors: Perceptual and Acoustic Findings
 
Author Affiliations & Notes
  • Christopher Dromey
    Department of Communication Disorders, Brigham Young University, Provo, UT
  • Elise Hunter
    Department of Communication Disorders, Brigham Young University, Provo, UT
  • Shawn L. Nissen
    Department of Communication Disorders, Brigham Young University, Provo, UT
  • 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 Christopher Dromey: dromey@byu.edu
  • Editor-in-Chief: Julie Liss
    Editor-in-Chief: Julie Liss×
Article Information
Hearing & Speech Perception / Acoustics / Speech, Voice & Prosody / Speech / Research Notes
Research Note   |   March 15, 2018
Speech Adaptation to Kinematic Recording Sensors: Perceptual and Acoustic Findings
Journal of Speech, Language, and Hearing Research, March 2018, Vol. 61, 593-603. doi:10.1044/2017_JSLHR-S-17-0169
History: Received May 4, 2017 , Revised July 14, 2017 , Accepted November 21, 2017
 
Journal of Speech, Language, and Hearing Research, March 2018, Vol. 61, 593-603. doi:10.1044/2017_JSLHR-S-17-0169
History: Received May 4, 2017; Revised July 14, 2017; Accepted November 21, 2017

Purpose This study used perceptual and acoustic measures to examine the time course of speech adaptation after the attachment of electromagnetic sensor coils to the tongue, lips, and jaw.

Method Twenty native English speakers read aloud stimulus sentences before the attachment of the sensors, immediately after attachment, and again 5, 10, 15, and 20 min later. They read aloud continuously between recordings to encourage adaptation. Sentence recordings were perceptually evaluated by 20 native English listeners, who rated 150 stimuli (which included 31 samples that were repeated to assess rater reliability) using a visual analog scale with the end points labeled as “precise” and “imprecise.” Acoustic analysis began by segmenting and measuring the duration of the fricatives /s/ and /ʃ/ as well as the whole sentence. The spectral center of gravity and spectral standard deviation of the 2 fricatives were measured using Praat. These phonetic targets were selected because the standard placement of sensor coils on the lingual surface was anticipated to interfere with normal fricative production, causing them to become distorted.

Results Perceptual ratings revealed a decrease in speech precision after sensor attachment and evidence of adaptation over time; there was little perceptual change beyond the 10-min recording. The spectral center of gravity for /s/ decreased, and the spectral standard deviation for /ʃ/ increased after sensor attachment, but the acoustic measures showed no evidence of adaptation over time.

Conclusion The findings suggest that 10 min may be sufficient time to allow speakers to adapt before experimental data collection with Northern Digital Instruments Wave electromagnetic sensors.

Acknowledgments
This work was completed as part of the second author's master's thesis. We express appreciation to the David O. McKay School of Education at Brigham Young University for financial support. A poster based on this research was presented on November 2016 at the 5th Joint Meeting Acoustical Society of America and Acoustical Society of Japan, Honolulu, HI.
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