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EEG based functional brain networks analysis in dyslexic children during arithmetic task.

N P Guhan Seshadri1, B Geethanjali2, Bikesh Kumar Singh1

  • 1Department of Biomedical Engineering, National Institute of Technology Raipur, Raipur, India.

Cognitive Neurodynamics
|October 14, 2022
PubMed
Summary
This summary is machine-generated.

Developmental dyslexia in children shows altered brain network connectivity during arithmetic tasks. Dyslexic children exhibit impaired fact retrieval and distinct topological changes in brain networks.

Keywords:
Arithmetic taskDevelopmental dyslexiaEEGFunctional connectivityGraph theoryNetwork analysis

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • Developmental dyslexia is a neurodevelopmental disorder characterized by phonological processing deficits.
  • Understanding the neural underpinnings of cognitive tasks in dyslexic children is crucial.

Purpose of the Study:

  • To investigate functional brain network changes in dyslexic children during arithmetic task performance.
  • To compare brain network topology between dyslexic children and normally developing children (NDC).

Main Methods:

  • Electroencephalogram (EEG) was used to record brain activity in 15 dyslexic and 15 NDC children.
  • Graph theory methods were applied to analyze functional network measures (node strength, clustering coefficient, characteristic pathlength).
  • Connectivity patterns were examined across different frequency bands (delta, theta, alpha, beta, gamma).

Main Results:

  • Dyslexic children demonstrated significantly lower accuracy in arithmetic tasks compared to NDC.
  • Increased delta band connectivity and reduced theta, alpha, and beta band connectivity were observed in temporoparietal and prefrontal regions of dyslexic children.
  • Altered node strengths, reduced clustering coefficient (theta, alpha bands), and increased characteristic pathlength (theta, alpha bands) were found in dyslexic participants.

Conclusions:

  • The findings suggest a poor fact-retrieval mechanism in dyslexic children during arithmetic tasks.
  • Evidence points towards an altered network topology in the brains of dyslexic children.
  • These neurophysiological differences highlight specific challenges faced by dyslexic individuals in numerical cognition.