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Disrupted stepwise functional brain organization in overweight individuals.

Hyebin Lee1,2, Junmo Kwon1,2, Jong-Eun Lee1,2

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Summary

Overweight individuals exhibit altered brain network organization, with decreased connectivity in sensory and attention networks. These changes correlate with eating behaviors, suggesting disrupted hierarchical brain function in obesity.

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Obesity Research

Background:

  • Functional brain hierarchy organizes neural networks, crucial for sensory and cognitive processes.
  • Overweight individuals display altered network activity, particularly in sensory and cognitive control systems.
  • Quantitative data on hierarchical brain organization in overweight populations is limited.

Purpose of the Study:

  • To quantitatively assess functional brain hierarchy alterations in overweight individuals compared to healthy weight controls.
  • To investigate changes in functional connectivity across different hierarchical steps in the brain.
  • To explore the association between altered brain network organization and eating behaviors.

Main Methods:

  • Stepwise functional connectivity analysis was employed, seeding from brain regions linked to obesity.
  • Functional connectivity and degree were compared between overweight and healthy weight groups at varying step distances.
  • Associations between functional network degrees and eating behaviors (hunger, disinhibition) were examined.

Main Results:

  • Both groups showed strong connectivity in somatomotor and prefrontal cortices, converging to transmodal systems with increased steps.
  • Overweight individuals exhibited decreased functional degree in somatosensory and attention networks compared to controls.
  • Visual and limbic networks showed an increasing trend in functional degree in the overweight group.
  • Sensory network functional degrees negatively correlated with hunger and disinhibition-related eating behaviors.

Conclusions:

  • Overweight individuals demonstrate disrupted functional network organization along the brain's hierarchical axis.
  • Altered brain connectivity patterns in overweight individuals are linked to specific eating behaviors.
  • Findings offer insights into the neural underpinnings of obesity and related behaviors.