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Priming and backward influences in the human brain: processing interactions during the stroop interference effect.

L G Appelbaum¹, K L Meyerhoff, M G Woldorff

¹Center for Cognitive Neuroscience, Duke University, Durham, NC 27708, USA.

Cerebral Cortex (New York, N.Y. : 1991)

|March 27, 2009

Summary

Temporal dynamics of Stroop interference reveal that irrelevant stimuli preceding targets enhance conflict effects. Conversely, stimuli following targets show reduced backward influence, impacting neural processing and behavior.

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Area of Science:

Cognitive Neuroscience
Psychology
Human Brain Mapping

Background:

The Stroop task is a classic measure of selective attention and cognitive control.
Understanding the temporal dynamics of neural processing during interference is crucial for cognitive models.

Purpose of the Study:

To investigate how the timing of irrelevant stimulus presentation affects neural processing and behavior during Stroop interference.
To differentiate between forward and backward influences of distractors on cognitive control.

Main Methods:

High-density event-related potentials (ERPs) and behavioral performance were recorded.
Participants performed a Stroop task with varying stimulus onset asynchronies (SOAs) between relevant and irrelevant stimuli.
Stimulus congruency (congruent, neutral, incongruent) was manipulated.

Main Results:

Incongruent stimuli led to slower reaction times and more errors compared to congruent stimuli.
ERPs showed distinct early negative and later positive components modulated by congruency and SOA.
The greatest behavioral and electrophysiological effects occurred when irrelevant stimuli preceded the target, indicating a 'priming influence'.
Reduced effects were observed when irrelevant stimuli followed the target, suggesting a diminished 'backward influence'.

Conclusions:

Neural processing of Stroop interference is time-dependent, with preceding irrelevant information exerting a stronger influence.
Two distinct temporal processes, 'priming influence' and 'backward influence', modulate conflict processing.
These findings contribute to understanding the temporal unfolding of cognitive control mechanisms.