2. 考研
  3. Recent findings suggest that visual signals are fed into at least three separate processing systems in the brain, each with its

Recent findings suggest that visual signals are fed into at least three separate processing systems in the brain, each with its

admin2020-08-17  13
问题     Recent findings suggest that visual signals are fed into at least three separate processing systems in the brain, each with its own distinct function. One system appears, to process information about shape perception; a second, information about color; a third, information about movement, location, and spatial organization. An understanding of the functions and capabilities of these three systems can shed light on how artists manipulate materials to create surprising visual effects.
    It is possible to summarize the functions of the three subsystems of the visual system as follows. The parvo system carries highly detailed information about stationary objects and about borders that are formed by contrasting colors. It does not, however, carry information about specific colors. Because much of the information about the shape of objects can be represented by their borders, we suspect that this system is important in shape perception. The blob system processes information about colors, but not about movement, shape discrimination, or depth. The magno system carries information about movement and depth. It is good at detecting motion but poor at scrutinizing stationary images. In addition it appears to be colorblind; it is unable to perceive borders that are visible only on the basis of color contrast.
    Cells in parvo system can distinguish between two colors at any relative brightness of the two. Cells in the color-blind magno system, on the other hand, are analogous to a black-and-white photograph in the way they function: they signal information about the brightness of surfaces but not about their colors. For any pair of colors there is a particular brightness ratio at which two colors, for example red and green, will appear as the same shade of gray in a black-and-white photograph, hence any border between them will vanish. Similarly at some relative red-to-green brightness level, the red and green will appear identical to the magno system. The red and green are then called equi-luminant. A border between two equi-luminant colors has color contrast but no luminance contrast.
    Many artists have seemed to be empirically aware of these underlying principles and have used them to maximize particular effects. Some of the peculiar effects of Op Art, for example, probably arise from color combinations that are strong activators of the parvo system but are weak stimuli for the magno system. An object that is equi-luminant with its background looks vibrant and unstable. The reason is that the parvo system can signal the object’s shape but the magno system cannot see its borders and therefore cannot signal either the movement or the position of the object. Hence it seems to jump around, drift, or vibrate on the canvas.
The passage suggests which of the following about the magno system?
选项 A、It perceives shapes on the basis of color contrast.
B、It perceives borders on the basis of luminance contrast.
C、It can detect motion but it cannot signal the position of an object.
D、It is better at perceiving stationary objects than it is at detecting movement.
答案B
解析 事实细节题。第二段最后一句提到，magno系统不能基于颜色对比度感知边界，因此无法判断形状，A项与原文不符，故排除；第二段倒数第二句提到，magno系统善于侦测运动的物体，D项与原文不符；C项前半句与原文一致，但后半句与原文不符，虽然文中最后一段提到magno system不能识别出物体的位置，但这是欧普艺术的原理：只有当物体和背景亮度一致时，magno系统才不能确定物体的位置。这不是magno系统的一般特征，故排除C项；B项表达的含义相同，为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/l0ra777K
本试题收录于： 翻译硕士（翻译硕士英语）题库专业硕士分类
0

翻译硕士（翻译硕士英语）

专业硕士

相关试题推荐
随机试题
最新回复(0)