AUTHOR=Huang Dengfeng , Ren Aifeng , Shang Jing , Lei Qiao , Zhang Yun , Yin Zhongliang , Li Jun , von Deneen Karen M. , Huang Liyu 

TITLE=Combining Partial Directed Coherence and Graph Theory to Analyse Effective Brain Networks of Different Mental Tasks

JOURNAL=Frontiers in Human Neuroscience

VOLUME=10

YEAR=2016

URL=https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2016.00235

DOI=10.3389/fnhum.2016.00235

ISSN=1662-5161

ABSTRACT=<p><bold>Purpose:</bold> 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.</p><p><bold>Methods and Materials:</bold> 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.</p><p><bold>Results:</bold> 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.</p><p><bold>Significance:</bold> This study reveals the network measures during different mental states and efficiency measures may be used as characteristic quantities for improvement in attentional performance.</p>