Max Planck Institute for Mathematics in the Sciences, Inselstr. 22, 04103 Leipzig, Germany.
J Neurosci Methods. 2010 Aug 30;191(2):171-9. doi: 10.1016/j.jneumeth.2010.06.018. Epub 2010 Jun 30.
In experimental visual neuroscience brief presentations of visual stimuli are often required. Accurate knowledge of the durations of visual stimuli and their signal shapes is important in psychophysical experiments with humans and in neuronal recordings with animals. In this study we measure and analyze the changes in luminance of visual stimuli on standard computer monitors. Signal properties of the two most frequently used monitor technologies, cathode ray tube (CRT) and liquid crystal display (LCD) monitors, are compared, and the effects of the signal shapes on the stated durations of visual stimuli are analyzed. The fundamental differences between CRT and LCD signals require different methods for the specification of durations, especially for brief stimulus presentations. In addition, stimulus durations on LCD monitors vary over different monitor models and are not even homogeneous with respect to different luminance levels on a single monitor. The use of LCD technology for brief stimulus presentation requires extensive display measurements prior to the experiment.
在实验视觉神经科学中，通常需要短暂呈现视觉刺激。在人类心理物理学实验和动物神经元记录中，准确了解视觉刺激的持续时间及其信号形状非常重要。在这项研究中，我们测量和分析了标准计算机显示器上视觉刺激的亮度变化。比较了两种最常用的显示器技术，阴极射线管（CRT）和液晶显示器（LCD）显示器的信号特性，并分析了信号形状对所陈述的视觉刺激持续时间的影响。CRT 和 LCD 信号之间的根本差异要求采用不同的方法来指定持续时间，特别是对于短暂的刺激呈现。此外，LCD 显示器上的刺激持续时间因不同的显示器型号而异，甚至在单个显示器上不同亮度级别之间也不具有同质性。对于短暂的刺激呈现，使用 LCD 技术需要在实验之前进行广泛的显示测量。
