In the monkey LGN, 70-80% of the cells are spectrally opponent, while very few spectrally opponent cells are found in the cat LGN. This may be the reason that monkeys

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Spectrally opponent cells are crucial for color vision because they compare the output from different types of cone cells, which are sensitive to different wavelengths of light. The high percentage of spectrally opponent cells in the monkey LGN suggests a sophisticated color vision system, enabling monkeys to distinguish colors easily. In contrast, the scarcity of such cells in the cat LGN implies a less developed color vision, making it harder for cats to distinguish colors.

In the Monkey LGN, 70-80% of the Cells Are Spectrally