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Color Constancy is when the same shade of a color looks different due to the source of illumination not being known.

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Color blindness is a vision defect wherein the eye perceives some colors differently than others. This could result from the absence of cone colors.

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Opponent-process theory suggests that color perception is controlled by the activity of three opponent systems.

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The theory states that there are three receptors in the retina that are responsible for the perception of color. One receptor is sensitive to the color green, another to the color blue and a third to the color red.

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The ability of the brain to simultaneously process incoming stimuli of differing quality. Parallel processing is a part of vision in that the brain divides what it sees into four components: color, motion, shape, and depth.

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Illusory Contours refers to the visual phenomenon or optical illusion of perceiving contours in an object where none exist.

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When the optic nerve leaves the eye it creates a blind spot because there are no receptor cells.

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It is a simple wire-frame drawing of a cube with no visual cues as to its orientation, so it can be interpreted to have either the lower-left or the upper-right square as its front side.

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The human brain will activate different regions of the brain when looking at different things, such as, faces, houses, and chairs.

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The ability to detect certain types of stimuli, like movements, shape, and angles, requires specialized cells in the brain called feature detectors. The monkey will have different feature detectors than humans.