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Task-induced changes in brain entropy.

Aldo Camargo1, Gianpaolo Del Mauro1, Ze Wang1

  • 1Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA.

Journal of Neuroscience Research
|February 24, 2024
PubMed
Summary
This summary is machine-generated.

Task-based fMRI reveals changes in regional brain entropy (BEN). Task performance reduced peripheral BEN while increasing central sensorimotor and perception network BEN, indicating altered brain dynamics.

Keywords:
brain entropyresting-state fMRItask-fMRI

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Area of Science:

  • Neuroscience
  • Functional Magnetic Resonance Imaging (fMRI)

Background:

  • Regional brain entropy (BEN) quantifies system irregularity using resting-state fMRI (rs-fMRI).
  • Task-induced changes in regional BEN are understudied.
  • Understanding task-related brain dynamics is crucial for interpreting fMRI data.

Purpose of the Study:

  • To characterize task-induced regional BEN alterations.
  • To investigate the impact of task design on BEN measurements.
  • To differentiate genuine task effects from residual effects in control conditions.

Main Methods:

  • Utilized Human Connectome Project (HCP) fMRI data.
  • Calculated BEN from task-only fMRI (task BEN) and rs-fMRI (resting BEN).
  • Compared task BEN, control BEN, and resting BEN to isolate task-specific effects.

Main Results:

  • Task performance decreased peripheral cortical BEN and increased central sensorimotor/perception network BEN.
  • Control conditions showed similar entropy changes to resting state, suggesting residual task effects.
  • Task versus control BEN revealed reduced entropy in occipital, orbitofrontal, and parietal regions.

Conclusions:

  • Task performance significantly modulates regional brain entropy.
  • Residual task effects in control blocks can influence findings.
  • Specific brain regions exhibit distinct BEN changes during cognitive tasks.