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Perceptual formant discrimination during speech movement planning

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  • Hantao Wang
  • Yusuf Ali
  • Ludo Max

Abstract

Evoked potential studies have shown that speech planning modulates auditory cortical responses. The phenomenon’s functional relevance is unknown. We tested whether, during this time window of cortical auditory modulation, there is an effect on speakers’ perceptual sensitivity for vowel formant discrimination. Participants made same/different judgments for pairs of stimuli consisting of a pre-recorded, self-produced vowel and a formant-shifted version of the same production. Stimuli were presented prior to a “go” signal for speaking, prior to passive listening, and during silent reading. The formant discrimination stimulus /uh/ was tested with a congruent productions list (words with /uh/) and an incongruent productions list (words without /uh/). Logistic curves were fitted to participants’ responses, and the just-noticeable difference (JND) served as a measure of discrimination sensitivity. We found a statistically significant effect of condition (worst discrimination before speaking) without congruency effect. Post-hoc pairwise comparisons revealed that JND was significantly greater before speaking than during silent reading. Thus, formant discrimination sensitivity was reduced during speech planning regardless of the congruence between discrimination stimulus and predicted acoustic consequences of the planned speech movements. This finding may inform ongoing efforts to determine the functional relevance of the previously reported modulation of auditory processing during speech planning.

Suggested Citation

  • Hantao Wang & Yusuf Ali & Ludo Max, 2024. "Perceptual formant discrimination during speech movement planning," PLOS ONE, Public Library of Science, vol. 19(4), pages 1-13, April.
    • Handle: RePEc:plo:pone00:0301514
    DOI: 10.1371/journal.pone.0301514
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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. repec:plo:pone00:0060783 is not listed on IDEAS
    3. Steven J. Eliades & Joji Tsunada, 2018. "Auditory cortical activity drives feedback-dependent vocal control in marmosets," Nature Communications, Nature, vol. 9(1), pages 1-13, December.
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