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PSYC 450 Quiz 3 questions and answers complete solution graded A+ 2024/2025
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PSYC 450 Quiz 3 questions and answers complete solution graded A+ 2024/2025
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PSYC 450 Quiz 35.2 What is the difference between spectral power distribution and spectral reflectance?
Spectral power distribution is the intensity of the light at each different wavelength on the visual
spectrum. Spectral reflectance is how objects reflect light.
5.3 True of false? In a graph like Figure 5.2b, is the gray paper were a darker gray, its reflectance curve
would move up in the graph. Explain your answer.
I feel like it would move down the graph, since black is the darkest color and it is at the bottom of the
graph.
5.4 What are the 3 perceptual dimensions of color and how are they depicted in a color solid? Which of
these dimensions is lacking in a color circle?
The 3 dimensions are hue, saturation, and brightness.
Hue is the color that whatever object we see it. Hue does not take into account if the color is vivid,
bright, dim, etc. Hue is most closely associated with the wavelength of light.
Saturation is the vividness of a hue. For example, a red velvet robe is much more vivid, or saturated, than
a pastel pink flower. With that being said, the flower and the robe are still the same hue. Brightness is
the perceived amount of light.
Brightness is the one dimension that is not shown in the color circle.
5.5 Why are subtractive color mixes called "subtractive" and additive color mixtures called "additive"?
Mixtures are called subtractive because each substance in the mixture subtracts, or absorbs, different
colors. Additive color mixtures add wavelengths, instead of taking them away.
5.6 Why do red, green, and blue make a better set of primary colors than cyan, green, and blue?
This is because they can all be combined in different proportions to make a variety of other colors.
Want to make a big triangle in the color circle. Will encompass the largest amount of other colors.
Blue, green, and cyan make a very small triangle. Blue, green, and red make a better one
5.7 What is a metameric color-matching experiment designed to test?
This experiment tests to see which 2 different colors are perceived to be similar.
5.8 State the principle of univariance as it applies to cones.
Different cones are sensitive to different wavelengths. The principle of univariance states that absorption
of a photon of light results in the same response, regardless of the wavelength of light. Only able to
distinguish between brightness, not wavelengths.
5.9 The answer to the question of whether a person with only one type of cone could match any two
colors successfully is yes. Explain why.
, This is because they could distinguish between two colors based on changes in intensity.
5.10 In general, how many comparison lights would a person with 2 types of cones need to match any
given test light in a metameric color-matching experiment?
Only 2 primary colors for comparison lights are needed.
5.12 What were three observation made by Herig that could not easily be accounted for by trichromatic
representation of color vision?
When asked to put cards in to their similar color groups, participants made 4 color groups, not 3.
Another example is the color afterimages experiment, and the color pairs were always seen together.
5.14 What is the difference between a +S-ML neural circuit and a +ML-S neural circuit? Between a +L-M
circuit and a +M-L circuit?
+S-ML→ fires in response to short wavelength light. Above baseline
+ML-S→ fires in response to medium and long wavelength light. Below baseline
+L-M→ Above for long wavelength light, and below for medium wavelength light. Going to see red
+M-L→ Above for medium wavelength light. Below for long wavelength light. Going to see green
5.15 What is photo pigment bleaching and how is it involved in color afterimages?
Photo pigment bleaching is when a photon loses its ability to absorb light for a short period of time. It
relates to color afterimages in that. Once photo pigments are bleached to a certain wavelength, for a
short time they don't respond to it as well.
5.16 Match the phenomenon with the corresponding perception. ?
A- 1
B- 2
C- 3
D- 4
5.19 Describe the 3 types of dichromacy.
Protanopia→Has M and S cones, but lacks L cones
Deuteranopia→ Has L and S cones, but lacks M cones
Tritanopia→ Has L and M cones, but lacks S cones
5.21 Why did pointillist painters often avoid letting the dots and flicks of different colored paint overlap
and mix together?
The painters wanted to have the flicks and dots blend together and use additive mixing to perceive the
wanted color. Ex: when they put a certain amount of red and blue dotc close together, from far away
viewers would see purple.
5.22 If you looked at a digital video display through a magnifying glass powerful enough to let you see
the individual sub elements in the pixels, what color light would you see being emitted by each sub
element? Would these colors necessarily look equally bright?
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