a group of optical illusions wherein the level of a stimulant's attribute, like the brightness or size seen, is impacted by the existence of other stimulants which vary with regard to the same attribute.

CONTRAST ILLUSION: "Contrast illusions are often difficult for the naked eye to decipher correctly without taking any measurements or comparing the illusions to outside materials."
Cite this page: N., Pam M.S., "CONTRAST ILLUSION," in, April 7, 2013, (accessed April 19, 2021).