Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
Curr Biol. 2020 Sep 7;30(17):3304-3315.e4. doi: 10.1016/j.cub.2020.06.023. Epub 2020 Jul 10.
Motion vision is important in guiding animal behavior. Both the retina and the visual cortex process object motion in largely unbiased fashion: all directions are represented at all locations in the visual field. We investigate motion processing in the superior colliculus of the awake mouse by optically recording neural responses across both hemispheres. Within the retinotopic map, one finds large regions of ∼500 μm size where neurons prefer the same direction of motion. This preference is maintained in depth to ∼350 μm. The scale of these patches, ∼30 degrees of visual angle, is much coarser than the animal's visual resolution (∼2 degrees). A global map of motion direction shows approximate symmetry between the left and right hemispheres and a net bias for upward-nasal motion in the upper visual field.
运动视觉对于指导动物行为很重要。视网膜和视皮层都以非偏置的方式处理物体运动：视野中的所有位置都代表所有方向。我们通过在整个半球范围内光学记录神经反应来研究清醒小鼠的上丘中的运动处理。在视域图中，人们会发现约 500 μm 大小的大区域，其中神经元更喜欢相同的运动方向。这种偏好在深度方向上保持到约 350 μm。这些斑块的大小约为 30 度视场，比动物的视觉分辨率（约 2 度）要粗糙得多。运动方向的全局图显示左右半球之间大致对称，并且在上半视野中向上鼻侧运动存在净偏差。
