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A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance
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General Intelligence Is Associated with Working Memory-Related Functional Connectivity Change: Evidence from a

Hikaru Takeuchi1, Yasuyuki Taki1,2,3, Rui Nouchi4,5,6

  • 1Division of Developmental Cognitive Neuroscience, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan.

Brain Connectivity
|December 15, 2020
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Summary

Higher psychometric intelligence correlates with altered brain connectivity during working memory tasks. This suggests intelligence influences how brain networks dynamically interact to support cognitive functions like working memory.

Keywords:
N-back taskfunctional connectivityintelligencepsychophysiological interactionworking memory

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Intelligence Research

Background:

  • Psychometric intelligence is linked to working memory (WM) capacity and brain activity.
  • Understanding the neural basis of intelligence requires examining its relationship with WM-related functional connectivity.

Purpose of the Study:

  • To investigate the association between psychometric intelligence and WM-induced functional connectivity changes.
  • To clarify how general intelligence relates to dynamic brain network interactions during cognitive load.

Main Methods:

  • Utilized the Raven's Advanced Progressive Matrices to measure nonverbal reasoning (psychometric intelligence).
  • Employed the N-back paradigm to induce working memory load.
  • Analyzed functional connectivity changes in a cohort of 1221 young adults using neuroimaging techniques.

Main Results:

  • General intelligence positively correlated with WM-induced functional connectivity changes in the frontoparietal network.
  • Correlations were observed in brain regions showing increased connectivity (e.g., lateral parietal cortex) and decreased connectivity (e.g., language and memory processing areas, default mode network nodes).
  • Intelligence was associated with how key working memory nodes modulate interactions with other brain regions.

Conclusions:

  • Psychometric intelligence is associated with dynamic functional connectivity alterations during working memory tasks.
  • These findings highlight the role of intelligence in modulating large-scale brain network interactions to support cognitive demands.