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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Lateralized brain regions typically show increased activation with higher cognitive demand.
  • Cross-hemispheric recruitment, engaging homologous regions in the opposite brain hemisphere, has been observed in older adults and young adults at their limit.
  • It remains unclear if this is a general strategy across different executive tasks and brain regions.

Purpose of the Study:

  • To investigate if cross-hemispheric recruitment is a general cognitive strategy in adults.
  • To determine if executive task demand modulates bilateral brain activation beyond the prefrontal cortex.
  • To examine cross-hemispheric recruitment across different cognitive tasks, specifically working memory and action planning.

Main Methods:

  • Analysis of functional magnetic resonance imaging (fMRI) data from two distinct experiments.
  • Investigated tasks included retrospective working memory maintenance and prospective action planning.
  • Examined patterns of brain activation and lateralization across different cognitive loads and tasks.

Main Results:

  • Confirmed cross-hemispheric recruitment of the prefrontal cortex across both tasks and experiments.
  • Observed changes in brain lateralization, including cross-hemispheric recruitment, in the cerebellum, dorsal premotor cortex, and posterior parietal cortex during action planning.
  • Found that the parietal cortex exhibited cross-hemispheric recruitment during spatial working memory but not verbal working memory.

Conclusions:

  • The prefrontal cortex plays a domain-general role in cross-hemispheric recruitment.
  • Task-specific brain regions, such as the parietal cortex, also recruit their contralateral counterparts to enhance executive processing.
  • This suggests a flexible, adaptive neural strategy for managing cognitive load across various executive functions.