In his compelling demonstrations of color constancy,Land showed that a particular area of a Mondrian stayed the same color even though there were major changes in the wavelengths that it was reflecting,provided that the Mondrian was
A) illuminated.
B) illuminated by at least one wavelength.
C) illuminated by at least a low and a high wavelength.
D) illuminated by at least a low, a medium, and a high wavelength.
E) monochromatic.

Question

Quizplus · Accepted Answer

Land showed that for color constancy to occur, the visual system needs to compare the relative activity of three different types of cones (long, medium, and short wavelength-sensitive). Therefore, to maintain color constancy in a Mondrian, it would need to be illuminated with at least a low, a medium, and a high wavelength. Option D is the only choice that fits this requirement.

In His Compelling Demonstrations of Color Constancy,Land Showed That a Particular