Implicitly strengthened task-irrelevant stimulus-response associations modulate cognitive control: Evidence from an...

Area of Science:

• Cognitive neuroscience
• Neuroimaging
• Human brain mapping

Background:

• The proportion congruency effect is used to study cognitive control dynamics.
• Contingency learning accounts challenge attentional modulation theories of this effect.
• Understanding cognitive control during strengthened irrelevant stimulus-response (S-R) associations is crucial.

Purpose of the Study:

• Investigate how cognitive control operates with strengthened task-irrelevant S-R associations.
• Examine the interplay between proportion congruency and Simon effects.
• Identify neural correlates of cognitive control under conflicting S-R associations.

Main Methods:

• Developed a novel paradigm combining Simon effects with proportion congruency manipulation.
• Utilized functional neuroimaging (fMRI) to observe brain activity.
• Analyzed behavioral data for enhancement and reversal patterns of Simon effects.

Main Results:

• Behavioral results indicated participants predicted responses using strengthened task-irrelevant S-R associations.
• Neuroimaging showed proportion congruency effects interacting with task S-R associations.
• Increased activity in frontoparietal regions (SPL, dPMC, Pre-SMA/aMCC, DLPFC) during conflict between relevant and irrelevant S-R associations.

Conclusions:

• The anterior midcingulate cortex (aMCC) and dorsolateral prefrontal cortex (DLPFC) adapt to process conflict from strengthened irrelevant S-R associations.
• Superior parietal lobule (SPL) and dorsal premotor cortex (dPMC) may represent these strengthened irrelevant S-R associations.
• Cognitive control flexibly utilizes and adapts to learned S-R associations, including task-irrelevant ones.