Which CFF law states that light flashes above threshold appear the brightest when they last for 50-100ms?

The Broca-Sulzer Effect is a phenomenon observed in visual perception, particularly regarding the perceived brightness of light. This effect indicates that light flashes of a certain duration, specifically between 50 and 100 milliseconds, are perceived as being brighter than those of both shorter and longer durations. This perception is rooted in the temporal dynamics of the visual system, where the integration of visual information occurs over a brief period.

The shorter flashes may not be perceived with the same intensity because they do not allow sufficient time for the visual system to fully respond, while longer flashes often lead to a different kind of visual processing that can decrease perceived brightness due to factors like adaptation. The Broca-Sulzer Effect thus highlights the importance of timing in perceptual processes and helps to explain why certain durations of light presentation can enhance perceived brightness. Understanding this effect can assist in grasping the nuances of visual perception and how stimuli are integrated in time.