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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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Age-dependent changes in prefrontal intrinsic connectivity.

Xin Zhou1, Dantong Zhu, Fumi Katsuki

  • 1Department of Neurobiology and Anatomy, Wake Forest School of Medicine, Winston-Salem, NC 27157.

Proceedings of the National Academy of Sciences of the United States of America
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Brain development in adolescence involves changes in prefrontal cortex connectivity. Researchers found stronger inhibitory neural connections in adolescent monkeys, potentially supporting cognitive maturation.

Keywords:
cognitive developmentneurophysiology

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Cognitive Neuroscience

Background:

  • The prefrontal cortex (PFC) matures into early adulthood, paralleling cognitive development.
  • Understanding PFC activity changes during adolescent maturation is crucial but largely unknown.

Purpose of the Study:

  • To investigate alterations in PFC neuronal activity and functional connectivity during peri- and postpubertal maturation.
  • To identify neural substrates underlying cognitive advancements during adolescence.

Main Methods:

  • Assessed developmental stages of peripubertal rhesus monkeys using morphometric, hormonal, and radiographic measures.
  • Conducted behavioral and neurophysiological tests during working memory tasks.
  • Compared neuronal firing rates and intrinsic functional connectivity between peripubertal and adult monkeys using spike train cross-correlations.

Main Results:

  • Overall functional connectivity magnitude between PFC neurons was lower in peripubertal monkeys compared to adults.
  • Inhibitory (negative) functional connections were stronger and more prevalent in peripubertal monkeys.
  • Excitatory (positive) functional connections showed similar distributions in both age groups.

Conclusions:

  • Changes in intrinsic PFC neuronal connectivity, especially enhanced inhibition, may underlie cognitive capacity improvements during adolescent development.
  • This study highlights the role of altered neural inhibition in the maturation of cognitive functions during the peri- and postpubertal periods.