The age deficit on photopic counterphase flicker: Contrast, spatial frequency, and luminance effects
The age deficit on photopic counterphase flicker: Contrast, spatial frequency, and luminance effects
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DOI：
10.1037/h0087395
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发表时间：
2002-09-01
影响因子：
1.3
通讯作者：
Kline, DW
中科院分区：
文献类型：
--
作者：
Culham, JC;Kline, DW
本研究评估了对比敏感度和视网膜照度降低对阈上空间刺激时间分辨率的年龄相关性缺陷的贡献。在最佳折射的年轻和老年观察者中，在三种对比度水平（0.11、0.33和0.66）下，针对三种空间频率（每度1、4和8个周期）的正弦光栅测量了反相闪烁的辨别力。在两个较高的对比度水平和在两个较低的空间频率闪烁歧视的年龄缺陷无关的观察者对比敏感度。通过0.5 ND滤光片执行任务以模拟老年人眼中视网膜照度降低三分之二的年轻观察者的闪烁辨别力与老年观察者相似。与年龄相关的视网膜亮度降低似乎是阈上对比度水平下与年龄相关的时空缺陷的主要决定因素，尽管也可能涉及神经因素。
This study evaluated the contribution of reduced contrast sensitivity and retinal illuminance to the age-related deficit on the temporal resolution of suprathreshold spatial stimuli. The discrimination of counterphase flicker was measured in optimally refracted young and elderly observers for sinusoidal gratings of three spatial frequencies (1, 4, and 8 cycles per degree) at three contrast levels (0.11, 0.33, and 0.66). Age deficits in flicker discrimination at the two higher contrast levels and at the two lower spatial frequencies were unrelated to observer contrast sensitivity. Flicker discrimination of young observers who carried out the task through .5 ND filters to simulate a two-thirds reduction of retinal illuminance in the older eye, was similar to that of the elderly observers. An age-related reduction in retinal luminance appears to be a major determinant of the age-related spatiotemporal deficit at suprathreshold contrast levels, although neural factors may also be involved.