Talbot-Plateau law

Etymology
Named after Belgian scientist Joseph Plateau and English photography pioneer Henry Fox Talbot, who wrote on the topic in the 1830s.

Proper noun

 * 1) An experimental observation related to the psychophysics of vision. If a light flickers so rapidly that it appears continuous, then its perceived brightness will be determined by the relative periods of light and darkness: the longer the darkness, the weaker the light.