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Keith A Hutchison1, Julie M Bugg2, You Bin Lim2

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Attention Studies

Background:

  • The item-specific proportion congruency (ISPC) effect demonstrates reactive control in word-reading processes during Stroop tasks.
  • ISPC is characterized by a reduced Stroop effect for items frequently presented incongruently.
  • Understanding ISPC is crucial for elucidating the mechanisms of selective attention and cognitive control.

Purpose of the Study:

  • To investigate whether explicit, trial-by-trial congruency precues can proactively reduce the ISPC effect.
  • To examine the interaction between precueing and list proportion congruence (list PC) in modulating cognitive control.
  • To determine if precueing can influence proactive attentional control during color-word Stroop tasks.

Main Methods:

  • Experiment 1: Employed 100% valid congruency precues alongside list PC manipulation in a Stroop task.
  • Experiment 2: Utilized 70% valid congruency precues to signal expected trial conflict or congruence.
  • Measured reaction times and accuracy to assess the Stroop effect and ISPC under different precueing conditions.

Main Results:

  • 100% valid precues completely eliminated both the ISPC effect and the list PC effect.
  • 70% valid precues selectively reduced ISPC effects when participants anticipated conflict.
  • Precueing significantly influenced proactive control engagement, impacting attentional allocation.

Conclusions:

  • Explicit congruency precues effectively modulate proactive attentional control during Stroop tasks.
  • Precueing can diminish the influence of both item-specific and list-based biases on word-reading interference.
  • Findings highlight the flexibility of cognitive control mechanisms in response to explicit attentional guidance.