title: Functional brain networks for sensory maintenance in top-down selective attention to audiovisual inputs.
abstract: Sensory maintenance in top-down selective attention to audiovisual inputs involves distributed cortical activations, while the connectivity between the widespread cortical regions has not been well understood. Graph theory has been demonstrated to be a useful tool in the analysis of brain networks. In this study, we used graph theoretical analysis to investigate the functional brain networks for sensory maintenance in top-down selective attention to audiovisual inputs. Electroencephalograms (EEGs) of 30 channels were recorded from 13 young healthy subjects during a passive view task and a top-down intersensory selective attention task. Phase synchronization indices of EEG signals in pair were computed to construct weighted brain networks. We found small-world properties of the brain networks during both passive view state and top-down selective attentional state in α, β, and γ bands. In addition, the significantly increased clustering coefficient and decreased characteristic path length were observed for brain networks during attentional state compared with passive view state in both β band and γ band. Our results suggest that functional brain networks in higher frequency bands, i.e., β band and γ band, are integrated in different ways during attentional state compared with passive view state.
authors.forename: Xiangfei
authors.initials: X
authors.lastname: Hong
authors.forename: Junfeng
authors.initials: J
authors.lastname: Sun
authors.forename: Shanbao
authors.initials: S
authors.lastname: Tong
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods*; D000465:Algorithms; D000704:Analysis of Variance; D001288:Attention / Q000502:physiology*; D016000:Cluster Analysis; D003627:Data Interpretation, Statistical; D004569:Electroencephalography / Q000379:methods / Q000706:statistics & numerical data; D058407:Electroencephalography Phase Synchronization; D005260:Female; D005403:Fixation, Ocular; D006309:Hearing / Q000502:physiology; D006801:Humans; D008297:Male; D008959:Models, Neurological; D009415:Nerve Net / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods*; D011597:Psychomotor Performance / Q000502:physiology; D012677:Sensation / Q000502:physiology*; D014785:Vision, Ocular / Q000502:physiology; D055815:Young Adult