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Task context load induces reactive cognitive control: An fMRI study on cortical and brain stem activity.

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Increased working memory (WM) demands shift cognitive control towards reactive strategies. Brain activity reveals prefrontal cortex involvement and dopaminergic/noradrenergic system roles in adapting to task changes.

Keywords:
AX–continuous performance taskAttentionCognitive controlLocus coeruleusVentral tegmental area/substantia nigrafMRI

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Cognitive control flexibly engages prefrontal and neuromodulatory systems to adapt to changing task demands.
  • Internal and external factors influence cognitive control engagement during tasks.

Purpose of the Study:

  • To investigate if elevated working memory (WM) demands alter cognitive control modes in healthy young adults.
  • To examine the impact of manipulated contextual information maintenance on behavior and brain activity.

Main Methods:

  • Developed a novel variant of the AX-continuous performance task (AX-CPT) with manipulated WM load.
  • Conducted a web-based experiment and replicated findings with behavioral data from MRI scans.
  • Analyzed brain activity, including prefrontal cortex activation and brainstem activity.

Main Results:

  • Higher WM load correlated with more reactive behavioral responses, confirmed across different experimental settings.
  • The right dorsolateral prefrontal cortex showed distinct activation patterns for proactive (cue) and reactive (probe) modes.
  • Dopaminergic and noradrenergic systems are implicated in updating context representations and regulating task engagement.

Conclusions:

  • Cognitive control mode flexibly shifts from proactive to reactive under increased working memory load.
  • Neuromodulatory systems play a crucial role in dynamically regulating cognitive control processes.
  • Findings elucidate the neural mechanisms underlying adaptive cognitive control in response to varying task demands.