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Oscillatory responses to semantic and syntactic violations.

Aneta Kielar1, Jed A Meltzer, Sylvain Moreno

  • 1Rotman Research Institute, Toronto, Ontario, Canada.

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This study reveals distinct brain oscillatory responses to semantic and syntactic language violations. Event-related desynchronization (ERD) at 8-30 Hz and synchronization (ERS) at 1-5 Hz differ between violation types and are modulated by language expertise.

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Area of Science:

  • Neuroscience
  • Psycholinguistics
  • Cognitive Science

Background:

  • Event-related potentials (ERPs) are known responses to semantic and syntactic violations in sentences.
  • Oscillatory brain responses to these linguistic violations are less understood.
  • Time-frequency analysis of EEG data reveals changes in brain power during cognitive tasks.

Purpose of the Study:

  • To investigate oscillatory brain responses (event-related synchronization and desynchronization) to semantic and syntactic violations.
  • To compare these responses between monolingual and bilingual participants.
  • To examine the influence of language expertise and task demands on oscillatory responses.

Main Methods:

  • Participants (monolingual and bilingual) performed an acceptability judgment task involving sentences with semantic or syntactic violations.
  • EEG data were analyzed using time-frequency analysis to examine oscillatory power changes.
  • Scalp topographies and phase-locking of responses were assessed.

Main Results:

  • Both semantic and syntactic violations elicited 8-30 Hz event-related desynchronization (ERD) with distinct scalp distributions.
  • Semantic anomalies additionally elicited 1-5 Hz event-related synchronization (ERS), which was phase-locked and correlated with time-domain averages.
  • Language expertise modulated 8-30 Hz ERD for syntactic violations under increased executive task demands, with bilinguals showing reduced ERD.

Conclusions:

  • The 8-30 Hz ERD response may serve as a marker for linguistic processing, potentially reflecting neural processes distinct from ERPs.
  • Semantic and syntactic violations elicit separable oscillatory signatures in the brain.
  • Executive functions and language experience influence neural oscillations during syntactic processing.