Measuring contrast sensitivity.

Measuring contrast sensitivity.
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测量对比度灵敏度。

DOI:
10.1016/j.visres.2013.04.015
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发表时间:
2013-09-20
期刊:
影响因子:
1.8
通讯作者:
Bex, Peter
Bex, Peter
中科院分区:
心理学3区
文献类型:
--
作者:
Pelli, Denis G.;Bex, Peter

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对比敏感度定义了可见和不可见之间的阈值,对于基础和临床视觉科学具有明显的意义。Fechner在1860年的综述中报告说,对于非常广泛的目标和条件,阈值对比度为1%。虽然印刷图表仍在使用中,但计算机测试正变得越来越流行,因为它为广泛的刺激提供了有效的自适应阈值测量。基础研究和临床研究通常都想知道基本的视觉能力,而不考虑观察者的主观标准。标准效应通过使用客观任务最小化:多选项强制选择检测或识别。有许多选择可以降低猜测率,这使得每次试验都更有信息量,因此需要的试验更少。最后,可能出现拥挤或目标混淆的人群应该一次只测试一个目标。
Contrast sensitivity defines the threshold between the visible and invisible, which has obvious significance for basic and clinical vision science. Fechner's 1860 review reported that threshold contrast is 1% for a remarkably wide range of targets and conditions. While printed charts are still in use, computer testing is becoming more popular because it offers efficient adaptive measurement of threshold for a wide range of stimuli. Both basic and clinical studies usually want to know fundamental visual capability, regardless of the observer's subjective criterion. Criterion effects are minimized by the use of an objective task: multiple-alternative forced-choice detection or identification. Having many alternatives reduces the guessing rate, which makes each trial more informative, so fewer trials are needed. Finally, populations who may experience crowding or target confusion should be tested with one target at a time.
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