Research Of Brain Fatigue Caused By Watching 3DTV Using Complex Network Methods

As stereoscopic display technology advances,from the popularity of three-dimensional television(3DTV)to the rise of virtual reality,consumers can now enjoy unprecedented visual experience.However,the health risks caused by watching 3DTV,such as visual fatigue,dryness and queasiness,is receiving more and more attention.This paper utilizes complex system theory to study the brain complexity and the brain network state changes caused by watching 3DTV,and discusses the physiological mechanism of brain fatigue during long period of watching 3DTV.The major task and contribution of this paper are as following:1.Designed EEG experiment during resting-state and localized the source of EEG activity by conducting the signal tracing analysis before and after watching 2D/3DTV.The result indicated that the current density of ?2 frequency band was significantly increased at lingual gyrus,which greatly corresponds with the result of the subjective questionnaire.It shows that lingual gyrus is closely related to the brain fatigue and should be given special attention as a feature.2.Studying the complexity of EEG signal in the four wavebands,namely ?,?,?,?,through calculated multiscale entropy before,after and during watching 2D/3DTV.The result showed that the average multiscale entropy in occipital lobe significantly reduced after watching 3DTV,and the most serious fatigue was reached after watching 3DTV for about 50 min.3.Built brain effective network using Granger causality(GC),which is based on the EEG data before and after watching 3DTV.The analysis of parameters such as information flows and the hubs of network nodes shows that the intensity of ? waveband information flow increased its intensity on the occipital lobe.Meanwhile,the changes of the central lobe indicate that watching 3DTV is likely to trigger brain areas related to motor imagery because of the visual reality of 3DTV.4.Using resting-state fMRI to study the changes of small-world brain functional network before and after one-hour watching of 2D/3DTV.Designed resting-state fMRI experiment and calculated Pearson correlation coefficients between two regional time series to build brain functional network.Several small-world parameters were obtained,including cluster coefficient,characteristic path length,global efficiency,local efficiency and regional nodal efficiency.We conclude that one-hour watching of 2DTV will not increase the burden of brain.On the contrary,one-hour watching of 3DTV requires the brain to regulate the efficiency of information process in certain brain areas,such as temporal lobe and occipital lobe.5.Partitioning brain functional network before and after one-hour watching of 2D/3DTV by the community partitioning algorithm in complex networks.The result has shown that dorsal stream was activated after watching 3DTV through analyzed modularity and community,which has also verified that watching 3DTV requires the brain visual pathway to process stereoscopic display.Meanwhile,the result further proves that the visual conducting pathway-temporal lobe-basal ganglia loop is closely related to brain fatigue caused by long period of watching 3DTV.This paper discusses the changes of brain complexity and complex networks caused by long period of watching 3DTV and further delves into the mechanism of brain fatigue.The result of the study will provide an objective basis for brain fatigue assessment and effectively establish health criteria for the stereoscopic industry.