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Research on Mental Fatigue Caused by Watching 3DTVBased on EEG Signal Tracing Analysis |
Li Jian, Chen Guozheng, Chen Chunxiao* |
(Department of Biomedical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China) |
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Abstract With the popularization of 3DTV display technological, the mental fatigue caused by watching 3DTV is getting more and more attention. This paper aimed to explore the mental fatigue preliminary mechanism caused by prolonged watching of 3DTV. Five-minute EEG signals and subjective fatigue questionnaire forms from twenty subjects (sex ratio 1:1) were collected separately before and after one-hour watching of 2D/3DTV.Hilbert transform was utilized to analyze the EEG signals’ synchronism and spatial characteristics in different channels. Furthermore, the signal tracing analysis was used to localize the source of EEG activity.Based on the results of subjective fatigue questionnaire, significant mental fatigue was found one hour after watching 3DTV (P<0.01). Results indicated that the current density at the source was mostly reduced after watching 2D/3DTV with no significant differences (P>0.05). However, the current density of β2 frequency band was significantly increased at occipital lobe after watching 3DTV (P<0.01), which was also greatly correlated to the subjective fatigue factor (P<0.01). Meanwhile, the current density of β1 frequency band was significantly increased (P<0.05) after watching 3DTV at supramarginal gyrus (BA40), occipital lobe (BA18, BA19) and posterior central gyrus (BA3),which were related to the visual spatial information processing, compared with that of watching 2DTV. As a result, the brain would be in a state of fatigue after prolonged watching of 2D/3DTV. Compared with watching 2DTV, watching 3DTV would increase the burden of some local regions, such as occipital lobe and supramarginal gyrus, which might explain why it is easier to cause mental fatigue when watching 3DTV.
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Received: 24 March 2016
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