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Semantic processing during continuous speech production: an analysis from eye movements and EEG.

Jinfeng Huang1,2, Gaoyan Zhang3, Jianwu Dang3

  • 1Faculty of Human Sciences, University of Tsukuba, Ibaraki, Japan.

Frontiers in Human Neuroscience
|September 20, 2023
PubMed
Summary

Semantic coherence is key for fluent speech production, influencing how speakers plan words and access information. This study reveals distinct speech production modes and brain activity patterns related to semantic processing.

Keywords:
brain networkcontinuous speech productioneye-voice spansemantic processingspeech planning

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Area of Science:

  • Cognitive Neuroscience
  • Speech Science
  • Linguistics

Background:

  • Speech production research often uses simplified tasks, limiting real-world applicability.
  • Understanding the neurological basis of speech planning, especially in continuous speech, remains incomplete.

Purpose of the Study:

  • To investigate speech planning mechanisms during continuous speech production.
  • To analyze the impact of semantic consistency on speech planning and eye-voice span.
  • To explore the neurophysiological correlates of semantic processing in speech.

Main Methods:

  • Combined behavioral (eye movement, speech) and neurophysiological (EEG) data analysis.
  • Utilized a continuous speech production task with varying semantic consistency.
  • Analyzed eye movement patterns and brain activity.

Main Results:

  • Semantic coherence significantly facilitates fluent speech production by aiding lexical and phonological access.
  • Eye-voice span (EVS) dynamics varied with sentence regularity, indicating predictive processing.
  • Distinct speech production modes were identified, linked to semantic comprehension and prediction.
  • Neurophysiological data supported the dual pathway model, with frontal lobe involvement and specific brain network activation patterns related to semantic coherence.

Conclusions:

  • Semantic coherence plays a crucial role in continuous speech planning and production.
  • The study provides a robust framework for future research on speech production and planning.
  • Findings offer insights into the interplay between semantic processing, articulatory execution, and neurological underpinnings.