lecture 5: color vision

A subject views two patches of light. One patch consists of an additive mixture of 475 and 510 nm, and the other patch consists of an additive mixture of 490 and 520 nm. By adjusting the intensities of each of the wavelengths that constitute these patches, the subject is able to perfectly match the two patches. The subject’s vision:

could be either monochromatic, dichromatic, or trichromatic

Which of the following cone photopigments evolved most recently?

chlorolabe

Which of the following is not a perceptual attribute of color?

radiance

A monochromatic stimulus of which of the following wavelengths is least saturated?

570 nm

The four pairs of wavelengths listed below are viewed by a person with trichromatic vision. Which pair contains wavelengths that appear most similar to each other?

640 nm, 645 nm

When viewed by a monochromat, two patches of light look identical to each other. We can conclude that the two patches:

result in the same number of quantal absorptions

The complement of 580 nm is closest to:

480 nm

Which of the following hues cannot be produced by monochromatic light?

purple

A rod monochromat views two patches of light. One patch consists of a single wavelength (540 nm) and the other patch consists of an additive mixture of three wavelengths (425, 475, and 510 nm). If the subject is allowed to independently adjust the intensity of each of the wavelengths, which of the following will occur?

The subject will be able to match the two patches after adjusting the intensity of the wavelengths.

As the intensity of a stimulus of 540 nm is decreased, it appears more:

green

In the primate retina, which of the following are the most distal color opponent cells?

bipolar

The M-cone opsin gene is located on which chromosome?

x chromosome

According to the color-opponent theory, the red–green channel is capable of encoding which color(s)?

green and red

Which neurons manifest blue–yellow opponency?

konio

As lighting conditions change, the colors of illuminated objects tend to:

remain constant