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Auditory Cortex Processes Variation in Our Own Speech

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  • Kevin R Sitek
  • Daniel H Mathalon
  • Brian J Roach
  • John F Houde
  • Caroline A Niziolek
  • Judith M Ford

Abstract

As we talk, we unconsciously adjust our speech to ensure it sounds the way we intend it to sound. However, because speech production involves complex motor planning and execution, no two utterances of the same sound will be exactly the same. Here, we show that auditory cortex is sensitive to natural variations in self-produced speech from utterance to utterance. We recorded event-related potentials (ERPs) from ninety-nine subjects while they uttered “ah” and while they listened to those speech sounds played back. Subjects' utterances were sorted based on their formant deviations from the previous utterance. Typically, the N1 ERP component is suppressed during talking compared to listening. By comparing ERPs to the least and most variable utterances, we found that N1 was less suppressed to utterances that differed greatly from their preceding neighbors. In contrast, an utterance's difference from the median formant values did not affect N1. Trial-to-trial pitch (f0) deviation and pitch difference from the median similarly did not affect N1. We discuss mechanisms that may underlie the change in N1 suppression resulting from trial-to-trial formant change. Deviant utterances require additional auditory cortical processing, suggesting that speaking-induced suppression mechanisms are optimally tuned for a specific production.

Suggested Citation

  • Kevin R Sitek & Daniel H Mathalon & Brian J Roach & John F Houde & Caroline A Niziolek & Judith M Ford, 2013. "Auditory Cortex Processes Variation in Our Own Speech," PLOS ONE, Public Library of Science, vol. 8(12), pages 1-8, December.
  • Handle: RePEc:plo:pone00:0082925
    DOI: 10.1371/journal.pone.0082925
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    References listed on IDEAS

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    1. Steven J. Eliades & Xiaoqin Wang, 2008. "Neural substrates of vocalization feedback monitoring in primate auditory cortex," Nature, Nature, vol. 453(7198), pages 1102-1106, June.
    2. Shanqing Cai & Deryk S Beal & Satrajit S Ghosh & Mark K Tiede & Frank H Guenther & Joseph S Perkell, 2012. "Weak Responses to Auditory Feedback Perturbation during Articulation in Persons Who Stutter: Evidence for Abnormal Auditory-Motor Transformation," PLOS ONE, Public Library of Science, vol. 7(7), pages 1-13, July.
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