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Across 1. Only two cones function rather than three (3 words) 3. occurs for colored pigments (3 words) 5. when neurons in the retina become tired, other neurons respond more strongly to the complementary colors when we shift from looking at one image to looking at a white space 6.  Occurs when colored lights rather than pigments are mixed. (3 words) 7. Brightness detector neurons are excited regardless of wavelength. Therefore, complementary lights may cancel each other out, but they also add their brightness together. (5 words) 8. Color vision is determined by three different receptors (2 words) 9. Explains the law of complementarity, developed by Ewald Hering (3 words) 10. Three different wavelengths of light can be used to match any color that the eye can see if they are mixed in the appropriate proportions. (2 words) 12. Blue-yellow opponent neurons become excited by blue wavelengths but are inhibited by yellow wavelengths. (2 words)

Down 2. A diagram that shows two laws of the additive color mixing. (3 words) 4. When pairs of wavelengths are added together, produce a visual sensation of white. (3 words) 11. electromagnetic energy that can be described as a particle moving through space like a wavelength.