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Explanation: People who suffer red-green deficiency have trouble perceiving the number within the design.

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Definition: perceiving familiar objects as having consistent color, even if changing illumination alters the wavelengths reflected by the object.

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Definition: the theory that opposing retinal processes (red-green, yellow-blue, white-black) enable color vision.

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Definition: There are no receptor cells where the optic nerve leaves the eye. This creates a blind spot in our vision.

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Definition: The processing of several aspects of a problem simultaneously; the brains natural mode of information processing for many functions, including vision. Contrasts with the step by step processing of most computers and of conscious problem solving.

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Explanation: Stimulated neutral networks respond to the illusory triangle as humans do as if it were a real triangle, and not what it really is: merely three Pac-Man faces.

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Explanation: As you stare at this cube, providing fairly constant stimulation to your retina, your perception and accompanying neutral activity in your brain, will change every couple of seconds.

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

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Definition: 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 color.

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Explanation: nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle, or movement.