In the Simultaneous Contrast Effect, a medium-gray square placed next to pure white will appear how?

Answer

Darker than it actually is

This effect demonstrates that the visual system judges elements relatively by comparing adjacent elements rather than assessing absolute values. When next to bright white, the gray appears darker by contrast.

In the Simultaneous Contrast Effect, a medium-gray square placed next to pure white will appear how?
causevisionopticsillusionperception