Question 1

According to the trichromatic theory, how many types of cones are present in the retina, and what does each type respond to?

Accepted Answer

Three types of cones, each sensitive to a different range of wavelengths.

Question 2

Which stage of visual perception does the trichromatic theory primarily explain?

Accepted Answer

The first stage, occurring in the retina.

Question 3

What phenomenon does the opponent process theory explain that the trichromatic theory cannot?

Accepted Answer

Afterimages

Question 4

If a person has deuteranopia, which type of cone is not functioning?

Accepted Answer

Green (M)

Question 5

Which color pair is NOT considered an opponent pair in the opponent process theory?

Accepted Answer

Green / Yellow

Question 6

A person stares at a green image for a long time and then looks at a white surface, seeing a magenta afterimage. Which theory best explains this phenomenon?

Accepted Answer

Opponent process theory

Question 7

Which equation best represents the response of a cone to a range of wavelengths, as shown in the trichromatic theory graph?

Accepted Answer

$$R(\lambda) = a \cdot e$$^{-\frac{(\lambda - \mu)^2}$${2\$$sigma^2$$}}$$

Question 8

Which of the following is a limitation of the trichromatic theory?

Accepted Answer

It cannot explain all color-processing phenomena, such as afterimages.

Question 9

In the opponent process theory, what happens when one color in a pair is stimulated for a long time?

Accepted Answer

The opposite color is perceived as an afterimage.

Question 10

Which stage of visual perception involves the interpretation of signals by the visual cortex, according to the opponent process theory?

Accepted Answer

Second stage

Question 11

A person with colorblindness cannot distinguish between red and green. Which theory best explains the physiological basis for this condition?

Accepted Answer

Trichromatic theory

Question 12

Which of the following best describes the pattern of activation in opponent process cells?

Accepted Answer

Activation for one color increases while the other decreases.

Question 13

If the blue cone (S) is non-functional, which color vision deficiency does this result in?

Accepted Answer

Tritanopia

Question 14

Which real-world scenario best illustrates the concept of afterimages?

Accepted Answer

A person stares at a blue screen for a minute, then looks at a white wall and sees yellow.

Question 15

Which formula would you use to model the overlap in cone sensitivity for color perception?

Accepted Answer

$$S(\lambda) = S_{L}(\lambda) + S_{M}(\lambda) + S_{S}(\lambda)$$

Question 16

Which of the following is NOT a color pair in the opponent process theory?

Accepted Answer

Orange / Purple

Question 17

Which theory would best explain why some individuals can see colors in dim light better than others?

Accepted Answer

Rod cell theory

Question 18

A patient reports seeing a yellow afterimage after staring at a blue object. Which neural mechanism is responsible for this?

Accepted Answer

Fatigue of blue/yellow opponent process cells

Question 19

Which of the following best describes the difference between trichromatic and opponent process theories?

Accepted Answer

Trichromatic theory explains initial color detection in cones, while opponent process theory explains later neural processing and afterimages.

Question 20

Which of the following is a direct application of the trichromatic theory in diagnosing color vision deficiencies?

Accepted Answer

Testing for the absence or malfunction of specific cone types using wavelength sensitivity graphs.

Color Vision: Theories and Disorders

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