Dissociated stimulus and response conflict effect in the Stroop task: Evidence from evoked brain potentials and brain oscillations

Jingting Zhao, Wei Kuang Liang, Chi Hung Juan, Lin Wang, Suiping Wang, Zude Zhu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The Stroop task is a classic paradigm that can be used to examine cognitive control as it contains conditions with and without interference. Cumulative evidence suggests that both stimulus and response conflict contribute to the Stroop interference effect. However, it remains unclear whether there are dissociable event-related potential (ERP) or frequency band-specific electroencephalographic (EEG) power changes associated with stimulus conflict and response conflict. To investigate potential markers for each form of conflict, we applied a Stroop 2-1 mapping task in 20 healthy young adults. Results showed that a negative deflection in the 350-500. ms time window (N450) and a positive deflection in the 600-900. ms time window (late positive component, LPC) were associated with response conflict and stimulus conflict, respectively. Time-frequency analyses found that both stimulus and response conflict induced theta band power changes and that response conflict additionally induced a beta band power change. These results indicate that stimulus and response conflict in the Stroop task are associated with different ERP effects and brain oscillatory features.

Original languageEnglish
Pages (from-to)130-138
Number of pages9
JournalBiological Psychology
Volume104
DOIs
StatePublished - 1 Jan 2015

Keywords

  • Cognitive control
  • ERP
  • LPC
  • N450
  • Neuronal oscillations
  • Stroop 2-1 mapping
  • Theta

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