Cortical Management of Spatial Resolution in Human Visual System

视觉灵敏度的改进是模糊适应性（VA）的后效应，我们测试了模糊适应性对视觉灵敏度的影响。在实验中，弗吉尼亚州的转变被追踪在适应的过程中，适应后的适应性和良好。模糊的视觉字段是由模糊过滤器提供的。视觉灵敏度是用Landolt C每分钟一次的快速和简化的楼梯方法来衡量的。当雾过滤器插入刺激和眼睛之间的时候，主题的VA掉了下来。就在下降之后， VA开始上升，然后，在一次之后，它到达了不对称的水平。在那一刻，过滤器被移走了，然后跳了起来，超越了原来的VA。在几分钟内，他回到了原来的水平。VA的临时改进程度是一个较大的，具有模糊过滤器和更长的适应期。这种在VA中的增强是由模糊适应及其后效应引起的。原来的VA可能不是眼睛的最佳性能。宁愿是可能的 ... More 在视觉系统中处于较高水平的处理水平，或受到控制。使用Landolt Cit has been shown that larger （或smaller） perceived size makes the letters' legibility higher （或lower） without changing their retinal size。这里我们已经研究了在被接受的大小中这样的变化会影响到视觉的清晰度。在实验中，视觉清晰度是用Landolt C的恒定刺激方法来衡量的。刺激是在一个三维立体视野中呈现的，它的感知大小是由改变观察者的融合角度来控制的。突破了视网膜图像的大小的实验，使眼睛和刺激之间的观察距离保持不变。人造管道被放置在观察员的眼睛的前面，以消除住宿效果。As a result， with the larger （or smaller） convergence angle， the stimulus appeared smaller （or larger） and the observer's visual acuity deteriorated （or enhanced）。我们对视觉清晰度的结果提出了建议，一般被认为是早期视觉系统的最基本质量，并且可以受到处理更高水平的感知的影响。Less（低）

・ Improvement of visual acuity as an aftereffect of the blur adaptationWe examined the influence of blur adaptation on the visual acuity (VA). In the experiment, the shift in VA was tracked in the course of adaptation and after the adaptation as well. The blurred visual field was provided by the foggy filter. The visual acuity was measured by a quick and simplified staircase method with Landolt C in every one minute. Subject's VA dropped when the foggy filter was inserted between the stimulus and the eye. Right after the drop, VA started rising and, after a while, it reached to the asymptote level. The moment the filter was removed, VA jumped up beyond the original VA. In a few minutes VA returned to the original level. The degree of temporary improvement in VA was larger with the hazier filter and longer adaptation period. This enhancement in VA is presumably caused by blur adaptation and its aftereffect. The original VA might not be the optimum performance of the eye. Rather it might … More be suppressed or controlled by the higher level of processing in the visual system.・ Influence of perceived size on the visual acuity measured with Landolt CIt has been shown that larger (or smaller) perceived size makes the letters' legibility higher (or lower) without changing their retinal size. Here we have examined whether such a change in the perceived size would affect the visual acuity as well. In the experiment, the visual acuity was measured by the constant stimuli method with the Landolt C. The stimulus was presented in a 3D stereoscopic view and its perceived size was controlled by changing the observer's convergence angle. Throughout the experiment the size of the retinal image was kept constant by keeping the viewing distance between the eye and the stimulus. Artificial pupils were placed in front of the observer's eyes to eliminate the accommodation effect. As a result, with the larger (or smaller) convergence angle, the stimulus appeared smaller (or larger) and the observer's visual acuity deteriorated (or enhanced). Our results suggest that the visual acuity, generally accepted as the most fundamental quality of early stage of visual system, can be affected by the size perception on the higher level of processing. Less