Which law is NOT related to Critical Flicker Fusion?

The correct answer is the DeVries-Rose Law, as it does not pertain specifically to Critical Flicker Fusion (CFF). Critical Flicker Fusion refers to the frequency at which an intermittent light stimulus is perceived as a steady light. The other laws are closely associated with this phenomenon.

The Talbot-Plateau Law discusses the relationship between the flicker frequency and the perceived brightness of light, indicating that as the frequency of flickering light increases, the brightness perception also changes. This plays a crucial role in understanding how CFF operates under different luminance levels.

The Ferry-Porter Law provides insight into how the critical flicker fusion frequency increases with the intensity of the light source, meaning brighter stimuli have a higher flicker fusion threshold.

The Granit-Harper Law elaborates further, asserting that at higher light intensities, the CFF increases more rapidly, which is significant for quantifying the perception of flicker in varying luminance conditions.

In contrast, the DeVries-Rose Law pertains to how perception of light intensity changes with luminance, particularly focusing on the response of the human visual system to changes in illumination rather than flicker perception specifically. Thus, while it relates to visual perception broadly, it does not