Center for Research in Optics, Leon, Guanajuato, Mexico.
Percept Mot Skills. 2011 Jun;112(3):691-702. doi: 10.2466/24.27.PMS.112.3.691-702.
Plateau's experiment, in which the bisection method was introduced, is recognized as the first psychophysical experiment ever done. That experiment was replicated and extended using modem imaging devices. First, participants with professional training in visual arts painted grayscales with no control on illumination. Then, the trained participants and the nontrained participants generated grayscales using a personal computer in three different conditions: a white background of a linearized monitor, a black background of that monitor, and a white background but without linearizing the monitor. Analyses showed that with artificial illumination, scales with steps more evenly spread were produced than with natural illumination. Humans do not seem to have a natural ability to use the bisection method properly. Experts seem to be able to judge the reflectance of distal stimuli, and perceptual learning played an important role in the perception of achromatic colors as found in prior literature.
普拉特的实验引入了二分法，被公认为有史以来第一个心理物理学实验。该实验使用现代成像设备进行了复制和扩展。首先，受过视觉艺术专业训练的参与者在没有照明控制的情况下用灰度级绘画。然后，受过训练的参与者和未受过训练的参与者在三种不同条件下使用个人计算机生成灰度级：线性化显示器的白色背景、该显示器的黑色背景和白色背景但不线性化显示器。分析表明，在人工照明下，产生的灰度级台阶分布更加均匀，而在自然光照明下则不是这样。人类似乎没有天生的能力正确使用二分法。专家似乎能够判断远端刺激的反射率，并且知觉学习在先前文献中发现的对非彩色的感知中起着重要作用。
