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.

运动视觉在指导动物行为方面很重要。视网膜和视觉皮层都以基本无偏的方式处理物体运动：在视野中的所有位置都表示所有方向。我们通过光学记录两个半球的神经反应来研究清醒小鼠上丘的运动处理。在视网膜定位图中，发现了约 500 μm 大小的大区域，其中神经元更喜欢相同的运动方向。这种偏好在深度上保持到 350 微米。这些斑块的尺度，约 30 度的视角，比动物的视觉分辨率（约 2 度）粗糙得多。运动方向的全局图显示了左右半球之间的近似对称性以及上部视野中向上鼻运动的净偏差。