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Cortical Management of Spatial Resolution in Human Visual System

人类视觉系统空间分辨率的皮层管理

基本信息

批准号：
18560039
负责人：
SHINODA Hiroyuki
金额：
$ 2.09万
依托单位：
Ritsumeikan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560039/
关键词：
Vision Spatial Resolution Visual Acuity Blur Adaptaion Cortex Brain Size Perception

项目摘要

・ 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

·视敏度的改善作为模糊适应的后效我们检查了模糊适应对视敏度（VA）的影响。在实验中，跟踪了适应过程中和适应后VA的变化。模糊的视野由雾状滤光片提供。用快速简化的阶梯法用Landolt C每分钟测一次视力。受试者的VA下降时，雾过滤器插入之间的刺激和眼睛。就在下降之后，VA开始上升，过了一段时间，它达到了渐近线水平。过滤器被移除的那一刻，VA跳到了原来的VA之上。几分钟后，它又回到了原来的水平。模糊滤波器和适应期越长，VA的暂时改善程度越大。这种VA的增强可能是由模糊适应及其后效引起的。原始VA可能不是眼睛的最佳性能。相反， ...更多信息被视觉系统中更高层次的处理所抑制或控制。·感知大小对用Landolt CI测量的视敏度的影响已经表明，较大（或较小）的感知大小使字母的易读性更高（或更低），而不改变其视网膜大小。在这里，我们已经研究了这种变化的感知大小是否会影响视力以及。实验中，用Landolt C.刺激呈现在一个三维立体视图和其感知的大小通过改变观察者的会聚角来控制。在整个实验过程中，通过保持眼睛和刺激物之间的观察距离，视网膜图像的大小保持恒定。在观察者眼前放置人工瞳孔以消除调节效应。结果，随着会聚角的增大（或减小），刺激物显得更小（或更大），观察者的视敏度变差（或增强）。我们的研究结果表明，视敏度，通常被认为是最基本的质量的早期视觉系统，可以影响的大小知觉的更高层次的处理。少