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Related Experiment Videos

The Stroop's test evokes a negative brain potential, the N400

M Rebai1, C Bernard, J Lannou

  • 1Université de Rouen, Faculté des Sciences et des Techniques Laboratoire de Neurophysiologie Sensorielle, Mont-Saint-Aignan-France.

The International Journal of Neuroscience
|December 12, 1997
PubMed
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Event Related Potentials (ERPs) reveal cognitive processes during the Stroop task. Automatic color word reading primes subsequent mental color naming, particularly when stimuli are discordant, indicated by a specific N400 wave.

Area of Science:

  • Cognitive Neuroscience
  • Psycholinguistics
  • Electrophysiology

Background:

  • The Stroop task is a classic test of selective attention and cognitive control.
  • Event-Related Potentials (ERPs) offer high temporal resolution for studying cognitive processes.
  • Understanding interference mechanisms in cognitive tasks is crucial for cognitive science.

Purpose of the Study:

  • To investigate the neural correlates of color word processing and mental color naming using ERPs.
  • To examine how stimulus congruency (concordant vs. discordant) affects ERPs during reading and mental naming.
  • To identify the specific ERP components associated with interference in a modified Stroop task.

Main Methods:

  • Recording ERPs from 8 right-handed subjects using 5 active electrodes (Fz, Cz, Oz, RH, LH).

Related Experiment Videos

  • Subjects performed a modified Stroop task involving reading color words and mentally naming colors.
  • Stimuli included concordant (e.g., red on red) and discordant (e.g., red on blue) color words.

    • Main Results:

    • ERPs for reading color words were similar for concordant and discordant stimuli, showing no N400 wave.
    • Mental naming of a color associated with the same written color also yielded no N400 wave.
    • A significant N400 wave at the Cz electrode was observed during mental naming of a color associated with a *different* written color.

    Conclusions:

    • Automatic reading of color words acts as a priming mechanism.
    • This priming interferes with the mental access to a different target color name when stimuli are discordant.
    • The N400 wave at Cz reflects this interference in cognitive processing during the Stroop task.