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a) waves vary in wavelength, the distance between successive peaks. Frequency, the number of complete wavelengths that can pass a point in given time. This depends on the wavelength. Shorter wavelength. The higher the pitch. Waves also vary in amplitude, the height from the peak to trough. Wave amplitude determines the intensity of colors and sounds.

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Neural center in the lambic system that helps process explicit memories for storage

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Afterimage effect

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Illusory triangle

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Color
Depth
Form
Motion

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Your brain constructs varying PERCEPTIONS