Localization Of Cortical Areas Related To Stereoscopic Vision And Research Of Visual Fatigue Caused By Watching 3DTV Based On FMRI

3DTV has become increasingly popular for its stereo and realistic feeling. However, the health risks caused by watching 3DTV, including visual fatigue, dryness and blurred vision, have also raised the researchers’ attention and unfortunately have become the bottleneck of restricting the development for 3DTV industry. This paper utilizes fMRI to study the cortical location related to stereoscopic vision and the relationship between visual fatigue and long period of watching 3DTV. The major task and contribution of this paper are as following:1. Researched the cortical location related to stereoscopic vision. Through comparing the human brain hemodynamic responses stimulated by experimental group of 3D images and controlled group of images using block and event-related fMRI designs, frontal eye field(BA8) and senior visual cortex(BA19) were found closely related to stereoscopic vision.2. Explored the activation intensity stimulated by different depths of the stereoscopic 3D images through fMRI study and found focus set at front depth can lead to more brain areas activated compared to the back depth, which reveals the depth of field is the key factor influencing the visual fatigue, and front depth of stereo images is relatively more likely to produce visual fatigue than back.3. Respectively acquired fMRI data during checkerboard visual stimulation before and after watching 3D/ 2DTV to detect variations of the brain areas and utilized questionnaire survey to detect visual fatigue caused by 3DTV. The BA8, BA18 and BA19 were more highlighted by the visual stimulus after watching 3DTV and which are closely related to stereoscopic vision. Watching 2DTV made difference in the limbic lobe. This result combined with subjective evaluation has shown that watching 3DTV is far more likely to cause visual fatigue than 2DTV.4. Designed rest fMRI to detect visual fatigue caused by 3DTV. Used ReHo and ALFF to measure the local synchronization and spontaneous neural activity before and after watching one hour 2D/3DTV. Watching 3DTV primarily causes visual fatigue and mild mental fatigue, while 2DTV mainly causes mild cognitive fatigue without apparent symptoms.This paper researched the adverse effects of watching 2D/3DTV on the brain and further delved into the mechanism of visual fatigue caused by long period of watching 3DTV. The result of the study will provide objective basis for visual fatigue assessment and health standard development of 3DTV.