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FACTORS IN PHSIOLOGICAL OPTICS ON VISUAL FATIGUE IN DISPLAY WORK

生理光学因素对陈列作品视疲劳的影响

基本信息

批准号：
60460068
负责人：
IKEDA MITUO
金额：
$ 4.03万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

项目摘要

In Experiment I, increment threshold was measured on flickering background stimulus of which waveform was one of step, sinusoidal, on-ramp, or off-ramp function. At low flicker frequencies, increments vary sinusoidally independent from the waveform of background stimulus suggesting that the first Fourier component is the most important factor. At high frequencies, increments fluctuate randomly. Above CFF, where subject does not see perceptual flicker, increment threshold differs from that on steady background of equal luminance. It suggests that some kind of transient responses occur in visual pathway, even though the stimulus looks steady.In Experiment ll, a target letter pattern was superimposed on a noise letter parrern of different chromaticity and luminance, and the percent correct in recognition of the target letter was measured for two stimulus sizes and two durations. One letter was white and the other was one of red, green, yellow, or blue. For all subjects, decrease of percent correct was found where the target is in equal luminance and/or equal brightness with the noise. At equal luminance condition, recognition of colored stimulus is easier than white one except yellow which is almost same as white. These color effects increase with stimulus size and duration. The results of Experiment ll showed that condition where target and noise (or background) are equal luminance and/or brightness is undesirable condition for recognizing a target letter in display work.

实验一采用阶跃、正弦、入斜波或出斜波函数对闪烁背景刺激的递增阈值进行测量。在低闪烁频率下，增量与背景刺激的波形成正弦关系变化，这表明第一傅立叶分量是最重要的因素。在高频下，增量随机波动。在CFF以上，当被试看不到知觉闪烁时，增量阈值不同于等亮度稳定背景下的增量阈值。实验二将目标字母图形叠加在不同色度和亮度的噪声字母参数上，测量了两种刺激大小和两个持续时间对目标字母识别的正确率。一个字母是白色的，另一个字母是红色、绿色、黄色或蓝色的。对于所有受试者，当目标处于与噪声相同的亮度和/或相同亮度时，发现准确率降低。在相同亮度条件下，彩色刺激比白色刺激更容易识别，但黄色刺激与白色刺激几乎相同。这些颜色效应随着刺激大小和持续时间的增加而增加。实验1的结果表明，目标和噪声(或背景)等于亮度和/或亮度的条件不适合在显示工作中识别目标字母。