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Deficiency in there cones and rods they cannot accurately process the image.
people who suffer red-green deficiency have trouble perceiving the number within the design.

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perceiving familiar objects as having consistent color, even if changing illumination alters the wave lengths reflected by the object.

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Young-Helmholtz trichromatic (three color) theory paint 

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Young-Helmholtz trichromatic (three color) theory paint 

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the theory that the retina contains three different color receptors, one most sensitive to red, one to green, one to blue, which when stimulated in combination can produce the perception of any

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The theory that opposing retinal processes enable color vision.

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def- the brain delegates the work of processing color, motion, form, and depth to different areas. processing different aspects of a problem simultaneously.

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explain pic- The triangle is not actually there but we think we see it because the shape is being made. simulated neural networks respond to the illusionary triangle as humans do-- as if it were a real triangle, and not what it really is: merely three pacman faces.

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explanation of pic- the way a person sees this cube, what way they look at it, do they see it from above or below? Underlines a persons perceptions.

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Explanation of pic- Looking at faces, houses, and chairs activates different brain areas in this right facing brain.

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Explanation of pic- most cells in the visual cortex respond only to particular features, other cells integrate information from these simpler ones.

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Def- Where the optic nerve leaves the eye there are no receptor cells creating a blind spot.