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Human cortical dynamics of auditory word form encoding.

Yizhen Zhang1, Matthew K Leonard2, Ilina Bhaya-Grossman1

  • 1Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94158, USA; Weill Institute for Neuroscience, University of California, San Francisco, San Francisco, CA 94158, USA.

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This summary is machine-generated.

The brain

Keywords:
electrocorticographyintracraniallanguageperceptionspeechwords

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Area of Science:

  • Neuroscience
  • Computational Auditory Neuroscience
  • Speech Processing

Background:

  • Continuous speech lacks clear acoustic word boundaries, yet humans perceive discrete words.
  • The superior temporal gyrus (STG) processes phonetic information, but whole-word encoding remains unclear.

Purpose of the Study:

  • Investigate how the human brain encodes auditory word forms.
  • Explore the neural dynamics underlying word perception in continuous speech.

Main Methods:

  • High-density cortical recordings during spoken narrative playback.
  • Analysis of STG activity for phonetic, prosodic, and lexical feature encoding.
  • Comparison with dynamics in a self-supervised artificial speech network.
  • Utilizing a bistable word perception task to probe neural responses.

Main Results:

  • STG activity shows a distinct reset at word boundaries, characterized by a sharp decrease in cortical activity.
  • Between resets, STG encodes acoustic-phonetic, prosodic, and lexical features, integrating them into word forms.
  • This encoding tracks relative elapsed time within words, independent of absolute duration, allowing flexible length representation.
  • Similar temporal dynamics observed in artificial neural networks processing speech.
  • STG responses correlated with perceived word boundaries in a bistable perception task.

Conclusions:

  • A novel dynamical model for auditory word form representation is proposed.
  • STG plays a crucial role in segmenting and encoding words in continuous speech.
  • The brain employs a flexible, time-based mechanism for representing variable-length words.