Brain Topography

, Volume 27, Issue 2, pp 279–292

High and Low Stimulus-Driven Conflict Engage Segregated Brain Networks, Not Quantitatively Different Resources

  • Leila Chouiter
  • Sebastian Dieguez
  • Jean-Marie Annoni
  • Lucas Spierer
Original Paper

DOI: 10.1007/s10548-013-0303-0

Cite this article as:
Chouiter, L., Dieguez, S., Annoni, JM. et al. Brain Topogr (2014) 27: 279. doi:10.1007/s10548-013-0303-0

Abstract

Task-irrelevant information is constantly present in our environment and may interfere with the processing of the information necessary to achieve goal-directed behavior. While task goals determine which information must be suppressed, the demand for inhibitory control depends on the strength of the interference induced by incoming, task-irrelevant information. Whether the same or distinct inhibitory processes are engaged to suppress various degrees of interference from task-irrelevant information remains largely unresolved. We investigated this question by manipulating the strength of the conflict induced by automatic word reading in a classical color Stroop task. High conflict was induced by presenting words in participant’s native language and low conflict by presenting words in a less familiar language. Behavioral performance and electrical neuroimaging analyses of event-related potentials to the words were analyzed following a two-by-two within-subject design with factors conflict strength (high; low) and color word/word ink congruency (congruent; incongruent). Behaviorally, we observed a significant conflict strength × congruency driven by a smaller Stroop effect in the low- than high conflict condition. Electrophysiologically, we observed a significant conflict strength × congruency interaction at the topographic level during the period of the N450 components, indicative of the engagement of distinct configurations of brain networks. No such interaction was found at the level of response strength. Electrical sources analyses localized the topographic effect within the anterior cingulate cortex and basal ganglia, left middle frontal and occipital areas. We interpret our results in terms of qualitatively distinct executive mechanisms for reactive inhibitory control in conditions of high versus low stimulus-driven conflict.

Keywords

Inhibitory control EEG Topography Electrical source estimation 

Supplementary material

10548_2013_303_MOESM1_ESM.tif (1.7 mb)
Suppl. Fig. 1The main effects of Conflict Strength and Congruency. a. Results of the global dissimilarity analysis for the main effects of factors Conflict Strength and Congruency. The p value of the main effects are plotted as a function of time; periods of significant topographic modulation (p < 0.05) are indicated in red. b. Results of the global field power (GFP) analysis for the main effects of factors Conflict Strength and Congruency. The p values of the main effects are plotted as a function of time (TIFF 1787 kb)

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Leila Chouiter
    • 1
  • Sebastian Dieguez
    • 1
  • Jean-Marie Annoni
    • 1
  • Lucas Spierer
    • 1
  1. 1.Neurology Unit, Laboratory for Cognitive and Neurological Sciences, Medicine DepartmentFaculty of Sciences, University of FribourgFribourgSwitzerland

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