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Working Memory Modulates Auditory Perceptual Sensitivity During Speech Planning.

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Maintaining a vowel in working memory biases auditory perception during speech planning. This suggests working memory influences speech production by shaping auditory representations and modulating speech outcomes.

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Area of Science:

  • Cognitive Neuroscience
  • Speech Science
  • Psycholinguistics

Background:

  • Working memory is crucial for speech production, but its precise influence on speech systems is not fully understood.
  • Investigating the interplay between working memory and auditory perception during speech planning is essential for clarifying this relationship.

Purpose of the Study:

  • To examine how maintaining a vowel in working memory affects perceptual sensitivity during the speech planning process.
  • To determine if working memory manipulation influences speech variability.

Main Methods:

  • Two experiments involving 32 healthy adults were conducted, incorporating concurrent working memory tasks with speaking and reading.
  • Participants produced monosyllabic words or silently read them while categorizing auditory probe stimuli.
  • Perceptual sensitivity and speech variability were measured, comparing congruent (matching working memory vowel) and incongruent trials.

Main Results:

  • Higher perceptual sensitivity was observed in congruent trials during speaking, indicating a bias in auditory perception.
  • No significant effect on perceptual sensitivity was found in the reading condition.
  • A trend towards reduced speech variability in congruent trials suggested working memory modulates speech outcomes, though no correlation was found between perceptual sensitivity and speech variability.

Conclusions:

  • Maintaining a vowel in working memory actively shapes auditory target representations.
  • Working memory influences speech outcomes, providing new insights into its role in speech systems.
  • This research highlights the dynamic interaction between memory, perception, and speech production.