Wang Fei, Yang Wenchao, Zhang Li, Gundran Andrew, Zhu Xun, Liu Jiajia, Li Xin, Bao Shanglian, Gao Song
Medical Physics Department, Health Science Center of Peking University, Beijing 100191, China; Beijing City Key Laboratory of Medical Physics and Engineering, Peking University, Beijing 100871, China.
Beijing City Key Laboratory of Medical Physics and Engineering, Peking University, Beijing 100871, China.
Phys Med. 2016 Oct;32(10):1308-1313. doi: 10.1016/j.ejmp.2016.07.007. Epub 2016 Jul 21.
The binocular disparity of two retina images is a main cue of stereoscopic vision. However, the global dependency between brain response and binocular disparity still remains unclear. Here, we used functional Magnetic Resonance Imaging (fMRI) to identify stereopsis-related brain regions with a modified Random Dot Stereogram (RDS) and plotted the activation variation curves under different disparity size. In order to eliminate the confounding shape difference between the stereogram and the plane, commonly seen in RDS, we modified the RDS to a checkerboard version. We found that V3A, V7 and MT+/V5 in dorsal visual stream were activated in stereoscopic experiment, while little activation was found in ventral visual regions. According to the activation trends, 13 subjects were divided into three groups: 5 subjects with turning points (a shift from increased to decreased activation), 5 subjects without turning points and 3 subjects with activation unrelated to disparity. We inferred that the dorsal visual stream primarily processes spatial depth information, rather than shape information.
两个视网膜图像的双眼视差是立体视觉的主要线索。然而，大脑反应与双眼视差之间的全局依赖性仍不清楚。在此，我们使用功能磁共振成像（fMRI），通过改良的随机点立体图（RDS）来识别与立体视觉相关的脑区，并绘制了不同视差大小下的激活变化曲线。为了消除RDS中常见的立体图与平面之间令人困惑的形状差异，我们将RDS修改为棋盘格版本。我们发现，在立体视觉实验中，背侧视觉通路中的V3A、V7和MT+/V5被激活，而腹侧视觉区域几乎没有激活。根据激活趋势，13名受试者被分为三组：5名有转折点的受试者（激活从增加转变为减少）、5名没有转折点的受试者和3名激活与视差无关的受试者。我们推断，背侧视觉通路主要处理空间深度信息，而非形状信息。
