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Psych 406 Exam 2 Devices Questions For Success 2024
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Psych 406 Exam 2 Devices Questions For Success 2024
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Psych 406 Exam 2 Devices Questions ForSuccess 2024
Explain why color is a psychophysical property, not a physical property - ANS color
is the result of wavelengths of light that reach our eye when reflected off of a
surface. the surface therefore has a "reflectance function" that determines what
color we perceive. color isn't a physical property because we can't see color at
night/dimly lit situations
What are the three steps to color perception? - ANS 1. detection: wavelengths
must be detected
2. discrimination: we must be able to tell the difference between one wavelength
(or mix) and another
3. appearance: assigning perceived colors to lights and surfaces in the world
Where do S M and L cones show the greatest sensitivity/give the greatest neural
response? - ANS S: 420-440
M: 535-555
L: 565-580
explain the difference between photopic and scotopic - ANS photopic: daylight;
light bright enough to stimulate the cone receptors and bright enough to saturate
the rods (elicit max response)
scotopic: night/dim; light not bright enough to activate cones, stimulate rods only
,are S M and L cone sensitivities exclusive to different parts of the spectrum? - ANS
no, spectral intensities overlap. the fact that they do and cones fire simultaneously
gives rise to all colors
what is the principle of univariance? - ANS the response from a single
photoreceptor cannot give accurate color discriminations based on wavelength.
infinite set of different wavelength-intensity combinations can elicit the exact
same response from a single type of photoreceptor
Explain why we are "color blind" at night using the principle of univariance - ANS
rods all have the same pigment, rhodopsin, therefore they all have the same
sensitivity to the same wavelengths
this proves that color is psychophysical and not physical
explain the trichromatic theory of color vision - ANS color of any light is defined by
our visual system by the relationships of three numbers (corresponding to the
outputs of three types of cones)
Young-Helmholtz theory of color vision
What is a metamer? - ANS illuminants that are physically distinct in regards to the
outputs that the cones give to the visual system but that will elicit the exact same
psychophysical response
ex: red and green wavelengths produce the same output that a yellow light does
, explain the difference between an additive and a subtractive color mixture - ANS
additive: adding wavelengths of light to make one color (green light + red light =
yellow light)
subtractive: mixture of pigments making one color, each of the pigments
absorbs/subtracts some wavelengths/colors and reflects only one (or a smaller
mix) of wavelengths
What were Georges Seurat's paintings an example of? - ANS additive color mixing,
the individually colored dots from far away looked like one color
What does the absorption spectrum reveal? - ANS describes the response of a
photoreceptor as a function of frequency
What layers do each type of cone go through in the LGN? - ANS S go through
konicellular
L and M go through parvocellular
What is the color space? - ANS it is a 3D representations of all of the visible colors.
3D because there are three dimensional axis, one for each cone. Hues are towards
the outside of the color space and saturation increases as you move towards the
center
explain the difference between nonspectral and unique hues - ANS nonspectral
hues can only be produced from mixtures of wavelengths (these can be altered
with by hue cancellation [you have a bluish-green light and you add red to it and it
will look blue only because red and green cancel out])
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