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Related Experiment Video

Updated: Jan 8, 2026

Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
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Accented speech modulates multiple event-related potential components across multiple levels of language processing.

Fernando Llanos1, Yunan Charles Wu2, Taylor J Abel3

  • 1Department of Linguistics, University of Texas at Austin, Austin, TX, 78712, USA. fllanos@utexas.edu.

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Summary

Listeners rapidly adapt to new accents by downweighting unfamiliar sounds, preserving core speech knowledge. This neural flexibility balances adapting to novel speech with maintaining stable language representations.

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Area of Science:

  • Cognitive Neuroscience
  • Auditory Processing
  • Speech Perception

Background:

  • Adapting to accented speech is crucial for communication but its neural basis is unclear.
  • Speech adaptation involves balancing neural plasticity with representational stability.
  • Understanding this trade-off is key to deciphering cognitive system flexibility.

Purpose of the Study:

  • Investigate neural mechanisms of accent adaptation.
  • Contrast two models: restructuring sound mappings vs. downweighting deviant sounds.
  • Examine how the brain manages plasticity and stability in speech processing.

Main Methods:

  • Recorded electroencephalography (EEG) from 23 native English speakers.
  • Participants categorized words in canonical American English and an unfamiliar accent.
  • Analyzed neural activity to assess sound representation and adaptation.

Main Results:

  • Listeners downweighted acoustic dimensions deviating from the norm based on short-term input.
  • Neural encoding of downweighted sound differences was less robust.
  • Adaptive neural adjustments occurred early (100ms) and persisted through processing stages.

Conclusions:

  • Rapid accent adaptation relies on downweighting sound cues, not full restructuring of native mappings.
  • This mechanism allows flexible adjustment to new speech while preserving long-term linguistic norms.
  • The auditory system effectively balances plasticity and stability during speech perception.