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The context-specific proportion congruent Stroop effect: location as a contextual cue.

Matthew J C Crump1, Zhiyu Gong, Bruce Milliken

  • 1Department of Psychology, Neuroscience & Behaviour, McMaster University, Hamilton, ON, Canada. crumpmj@mcmaster.ca

Psychonomic Bulletin & Review
|August 9, 2006
PubMed
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The Stroop effect is influenced by trial proportions. This study reveals a context-specific effect, suggesting rapid, stimulus-driven control beyond learned word-response associations in cognitive control.

Area of Science:

  • Cognitive Psychology
  • Experimental Psychology
  • Neuroscience

Background:

  • The Stroop effect, a measure of selective attention, is sensitive to the proportion of congruent and incongruent trials.
  • Existing theories often attribute this proportion effect to global, experiment-wide response strategies.
  • Recent findings suggest item-specific effects, challenging global strategy explanations.

Purpose of the Study:

  • To investigate the nature of proportion effects in the Stroop task.
  • To determine if item-specific proportion effects can be explained by learned word-response associations.
  • To demonstrate a context-specific proportion effect independent of learned associations.

Main Methods:

  • Two experiments were conducted using the Stroop task.

Related Experiment Videos

  • Participants completed trials with varying proportions of congruent and incongruent stimuli.
  • Analysis focused on identifying context-specific effects beyond word-response learning.

    • Main Results:

    • A context-specific proportion congruent effect was observed.
    • This effect could not be accounted for by learned associations between color words and responses.
    • Results indicate rapid, stimulus-driven control mechanisms.

    Conclusions:

    • The findings challenge explanations of the Stroop proportion effect solely based on learned word-response associations.
    • A context-specific proportion effect suggests rapid, stimulus-driven control processes are involved.
    • These results highlight the complexity of cognitive control in the Stroop task.