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Color Perception Exam with Complete Solutions
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Color Perception Exam with Complete Solutions
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Color Perception Exam with Complete Solutionspicture from color vision*- blue - ANS--anytime the blue cone gets activated, it has an
excitatory effect on the ganglion cell
-anytime it gets activated that's when we start seeing blue
-anytime we start seeing blue, it is because we are getting an excitatory input from the
Y-B ganglion cell
*picture from color vision*- green - ANS--the green cone will be most activated
-anytime green light is shining into the retina, the green ganglion cell is an excitatory
state and starts firing at a faster rate then resting state
-that's when our brain knows we are seeing green
*picture from color vision*- red - ANS--red light shining on retina and the red cone gets
activated more than any other cone, the ganglion cell gets inhibited and starts firing
slower than resting state
-this is the signal that travels through their axon and gets to the brain and that's all the
brain needs to receive to determine that it must be red
-yellow blue ganglion cell will not respond to this
*picture from color vision*- yellow - ANS--there is no yellow cone
-the response of the three cones is somewhat overlapping (blue responds to short
wavelength, green responds to medium wavelength, and red to long)
-yellow falls between red and green in the middle of long and medium
-if we shine yellow light on retina- the red and green cone will be activated
-the blue cone won't be activated because the blue cone is too far away (wavelength)
from where yellow would be
-Why don't we see red or green? they cancel each other out, since the R- is inhibitory
and G- is excitatory
-that is why you don't see red or green
-blue cone is not activated at all
-through bipolar layer, red and green cones are sending inhibitory signals to the yellow
ganglion cell
-anytime you inhibit a yellow/blue ganglion cell, you see yellow
3 types of cones in our retina - ANS-- starting from these 3 receptors, experience all
hues because any other color is the result of different mixing responses of these pure
colors
*problem*- yellow also appears to observe as "pure" color, adding lights is an additive
process, adding paint is a subtractive process--> red paint looks red because because it
absorbs all the wavelengths except the red wavelengths
-green paint looks green because it absorbs all the wavelengths except for green
-3 color receptors: 3 "primary colors"--> can't explain negative aftereffect
blended theory - ANS-3 color receptors (from Trichromatic theory) and there are 4
primary colors (from opponent process theory)
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