Cognition and its formation of shape and space in the visual handicapped

当CRT图像模糊时，正确率随着目标尺寸和目标与背景对比度的增大而增加。在低视力眼科疾病的视觉搜索中，反应时明显长于正常人。此外，如果汉字与背景之间的对比度增加，反应时间就会缩短。对3例受试者术后早期盲眼进行视知觉检查。主观轮廓的感知是有限的，但阴影与目标是不同的。三位受试者中有一位是用阴影透视感知深度的。在实际知觉中，通过主动触摸观察到有空洞的表面。当空洞和手指的曲率相似时，观察到最佳的巧妙错觉。具有触觉标志的自动取款机已经研制成功。盲人受试者评价它的机器是有用的。第一次的触觉反应时间约为10s。已经为盲人计算机用户开发了两种替代显示器。有鼠标操作经验的受试者使用触觉辅助装置比仅使用听觉装置效果更好。

When image on CRT is blurred, the correct percent is increased with the increase of target size and contrast between target and its background. In visual search for the low vision with opthalmological diseases, the reaction time is longer than that of normal subjects. Furthermore, if contrast between Chinese characters and its background is increased, the reaction time is shorten. Post operative visual perception in the early blind of three subjects was examined. Perception of subjective contour is limitted, but shadow is differenciated from targets. One of three subjects perceived the depth from perspective patten with shade. In tactual perception, the surface with a cavity was observed by active touch. The optimum tacile illusion is observed, when cavity and finger is similar in curvature. The ATM with tactile signs has been developped. The blind subjects evaluated that its machine is useful. Tactile reaction time is about 10s at first time. Two alternative displays have been developed for blind computer user. Subjects who had experience in the mouse operation used tactile assisting devise better than auditory device only.