Spatio-chromatic contrast sensitivity across the life span: interactions between age and light level in high dynamic range
Spatio-chromatic contrast sensitivity across the life span: interactions between age and light level in high dynamic range
复制标题
整个生命周期的空间色彩对比敏感度：高动态范围内年龄和光照水平之间的相互作用
DOI：
10.1167/jov.20.11.1286
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发表时间：
2020
影响因子：
1.8
通讯作者：
Ashraf M
中科院分区：
文献类型：
--
作者：
Ashraf M
我们研究了年轻的和年长的彩色正常观察者的空间-色度对比敏感度。我们测试了适应光线水平如何影响对比敏感度，以及是否存在与年龄相关的不同敏感度变化。在高动态范围显示器上，在0.02~2000cd/m2的背景亮度水平和不同的刺激大小下，沿颜色空间的三个方向(无色、红绿、黄紫色)测量对比敏感度。20名平均年龄为33岁的观察员和20名平均年龄为65岁的老年观察员参加了这项研究。在每一次会议中，观察者都完全适应了固定的背景亮度。我们的主要发现是：(1)对比敏感度随着背景亮度的增加而增加，当背景亮度达到200cd/m2左右时，对比度敏感度要么下降，要么在彩色对比度敏感度保持不变；(2)年轻组的敏感度比老年组平均高0.3log单位。(3)对比敏感度函数的峰值频率、峰值敏感度和截止频率随年龄增长呈下降趋势，且下降幅度与平均亮度有关。这些数据正在被建模，以预测对比敏感度作为年龄、亮度水平、空间频率和刺激大小的函数。
We investigated spatio-chromatic contrast sensitivity in both younger and older color-normal observers. We tested how the adapting light level affected the contrast sensitivity and whether there was a differential age-related change in sensitivity. Contrast sensitivity was measured along three directions in colour space (achromatic, red-green, yellowish-violet), at background luminance levels from 0.02 to 2000 cd/m2, and different stimuli sizes using 4AFC method on a high dynamic range display. 20 observers with a mean age of 33 yoa and 20 older observers with mean age of 65 participated in the study. Within each session, observers were fully adapted to the fixed background luminance. Our main findings are:(1) Contrast sensitivity increases with background luminance up to around 200 cd/m2, then either declines in case of achromatic contrast sensitivity, or remains constant in case of chromatic contrast sensitivity;(2) The sensitivity of the younger age group is higher than that for the older age group by 0.3 log units on average. Only for the achromatic contrast sensitivity, the old age group shows a relatively larger decline in sensitivity for medium to high spatial frequencies at high photopic light levels;(3) Peak frequency, peak sensitivity and cut-off frequency of contrast sensitivity functions show decreasing trends with age and the rate of this decrease is dependent on mean luminance. The data is being modeled to predict contrast sensitivity as a function of age, luminance level, spatial frequency, and stimulus size.