title: Dissociated stimulus and response conflict effect in the Stroop task: evidence from evoked brain potentials and brain oscillations.
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 350-500ms time window (N450) and a positive deflection in the 600-900ms 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.
authors.affiliation: School of Psychology and Center for the Study of Applied Psychology, South China Normal University, China.
authors.forename: Jingting
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Institute of Cognitive Neuroscience, National Central University, Taiwan.
authors.forename: Wei-Kuang
authors.initials: WK
authors.lastname: Liang
authors.affiliation: Institute of Cognitive Neuroscience, National Central University, Taiwan.
authors.forename: Chi-Hung
authors.initials: CH
authors.lastname: Juan
authors.affiliation: Key Laboratory of Behavioral Science, Institute of Psychology, Chinese Academy of Sciences, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.affiliation: School of Psychology and Center for the Study of Applied Psychology, South China Normal University, China.
authors.forename: Suiping
authors.initials: S
authors.lastname: Wang
authors.affiliation: School of Psychology and Center for the Study of Applied Psychology, South China Normal University, China; Collaborative Innovation Center for Language Competence, Jiangsu Normal University, China. Electronic address: zhuzude@gmail.com.
authors.forename: Zude
authors.initials: Z
authors.lastname: Zhu
mesh_terms: D000328:Adult; D001288:Attention / Q000502:physiology*; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D056344:Executive Function / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology*; D057190:Stroop Test; D055815:Young Adult
keywords: Cognitive control; ERP; LPC; N450; Neuronal oscillations; Stroop 2-1 mapping; Theta