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Event-related potentials in a lexical stroop task.

I Czigler1, G Csibra

  • 1Institute for Psychology of the Hungarian Academy of Sciences, Budapest.

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|December 1, 1991
PubMed
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This study found that reaction times (RT) for word decisions are faster than non-words. Lexical decision-making involves complex cognitive processes reflected in event-related potentials (ERPs).

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Psycholinguistics

Background:

  • Investigating the cognitive processes underlying word recognition.
  • Understanding how the brain processes lexical decisions and reaction times (RT).

Purpose of the Study:

  • To examine reaction times (RT) and event-related potentials (ERPs) during lexical decision tasks.
  • To explore the impact of letter sequence manipulation on word/non-word decisions.

Main Methods:

  • Subjects performed word/non-word decisions on four-letter strings.
  • Stimuli included original words/non-words and reordered letter strings.
  • Event-related potentials (ERPs) were recorded.

Main Results:

Related Experiment Videos

  • Non-word decisions had longer RTs than word decisions.
  • RT increased for non-word decisions on strings that formed words in a different order.
  • ERPs showed early negativity (approx. 240 ms) and later positivity related to lexical memory.

    • Conclusions:

    • Lexical decision-making involves distinct cognitive stages reflected in RT and ERPs.
    • Stimulus-response conflict influences ERPs, but not the motor potential.
    • A late positive wave (P3 complex) is associated with lexical memory processes.