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Local gradient analysis of human brain function using the Vogt-Bailey Index.

Christine Farrugia1,2,3, Paola Galdi4, Irati Arenzana Irazu5

  • 1Faculty of Engineering, L-Università ta' Malta, Msida, Malta. christine.farrugia@ed.ac.uk.

Brain Structure & Function
|January 31, 2024
PubMed
Summary
This summary is machine-generated.

The Vogt-Bailey (VB) index, a new tool for brain imaging analysis, measures local functional homogeneity by assessing network connectivity. It offers a novel way to detect changes in the human cortex

Keywords:
Cortical organizationFunctional connectivityRegional homogeneityVogt-Bailey index

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Area of Science:

  • Neuroimaging
  • Computational Neuroscience
  • Brain Network Analysis

Background:

  • Assessing local functional homogeneity in the human cortex is crucial for understanding brain organization.
  • Existing methods like Regional Homogeneity (ReHo) are commonly used but may have limitations.
  • The Vogt-Bailey (VB) index offers a novel approach to quantify local functional similarity.

Purpose of the Study:

  • To interpret the Vogt-Bailey (VB) index in terms of the minimum ratio cut.
  • To evaluate the performance of the VB index for analyzing local functional homogeneity in the human cortex.
  • To compare the VB index with the Regional Homogeneity (ReHo) algorithm.

Main Methods:

  • Interpreting the VB index as a minimum ratio cut of a network representing brain voxels and their connections.
  • Weighting network edges based on the modified Pearson correlation of fMRI time series between connected voxels.
  • Comparing the sensitivity of the VB index and ReHo in detecting changes in functional organization.

Main Results:

  • The VB index quantifies the degree of small-scale similarity in brain activity.
  • A higher VB index indicates stronger local functional similarity and greater difficulty in disconnecting the network.
  • The VB index demonstrates a unique ability to detect sharp changes in local functional organization.

Conclusions:

  • The VB index provides a robust measure of local functional homogeneity in the human cortex.
  • It offers advantages over traditional methods like ReHo in identifying localized changes in brain activity.
  • The VB index represents a valuable tool for advancing neuroimaging research.