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Abstract <p>Ambiguity resolution is crucial for adaptive behavior, but the mechanisms underlying possible implicit selection during disambiguation remain unclear. In semantic ambiguity resolution, while some frameworks propose suppression of non-selected meanings, others suggest implicit selection occurs without inhibitory mechanisms involvement. Building on our previous functional magnetic resonance imaging (fMRI) findings that suggested hippocampal inhibition during the processing of Russian fragmented word combinations, which had two possible variants of completion (the ambiguous condition), the present study used electroencephalography (EEG) to obtain independent confirmation. The EEG data revealed a decrease in hippocampal gamma band activity within the N400 time window for ambiguous trials compared to the control (unambiguous) condition. Gamma desynchronization is interpreted as a neurophysiological signature of the inhibitory mechanism involvement. The study thus provides convergent fMRI and EEG evidence supporting the inhibitory account of implicit selection during the completion of fragmented neighboring words.</p>

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Gamma band Desynchronization in EEG as Evidence for Inhibition of Non-selected Meanings during Implicit Ambiguity Resolution

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • M. Kokhova,
  • V. Gershkovich,
  • N. Moroshkina,
  • A. Korotkov,
  • I. Knyazeva,
  • M. Kireev

摘要

Abstract

Ambiguity resolution is crucial for adaptive behavior, but the mechanisms underlying possible implicit selection during disambiguation remain unclear. In semantic ambiguity resolution, while some frameworks propose suppression of non-selected meanings, others suggest implicit selection occurs without inhibitory mechanisms involvement. Building on our previous functional magnetic resonance imaging (fMRI) findings that suggested hippocampal inhibition during the processing of Russian fragmented word combinations, which had two possible variants of completion (the ambiguous condition), the present study used electroencephalography (EEG) to obtain independent confirmation. The EEG data revealed a decrease in hippocampal gamma band activity within the N400 time window for ambiguous trials compared to the control (unambiguous) condition. Gamma desynchronization is interpreted as a neurophysiological signature of the inhibitory mechanism involvement. The study thus provides convergent fMRI and EEG evidence supporting the inhibitory account of implicit selection during the completion of fragmented neighboring words.