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Updated: Mar 20, 2026
Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
Published on: November 8, 2012
Combining Partial Directed Coherence and Graph Theory to Analyse Effective Brain Networks of Different Mental Tasks
Dengfeng Huang1, Aifeng Ren2, Jing Shang2
1School of Life Science and Technology, Xidian UniversityXi'an, China; Department of Radiology, Medical Physics, University Medical Center FreiburgFreiburg, Germany.
Purpose:
The aim of this study is to qualify the network properties of the brain networks between two different mental tasks (play task or rest task) in a healthy population.
Methods And Materials:
EEG signals were recorded from 19 healthy subjects when performing different mental tasks. Partial directed coherence (PDC) analysis, based on Granger causality (GC), was used to assess the effective brain networks during the different mental tasks. Moreover, the network measures, including degree, degree distribution, local and global efficiency in delta, theta, alpha, and beta rhythms were calculated and analyzed.
Results:
The local efficiency is higher in the beta frequency and lower in the theta frequency during play task whereas the global efficiency is higher in the theta frequency and lower in the beta frequency in the rest task.
Significance:
This study reveals the network measures during different mental states and efficiency measures may be used as characteristic quantities for improvement in attentional performance.
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