Guttman and Kalish (1956) reinforced pigeons for pecking a particular color of light and then recorded their rate of pecking across the spectrum and found that:

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The findings of Guttman and Kalish (1956) demonstrated the principle of stimulus generalization. They found that pigeons would peck at lights of colors similar to the one they were trained with, but as the color of the light became more different from the training color, the rate of pecking decreased. This illustrates that the response rate declines as the stimulus becomes less similar to the conditioned stimulus.

Guttman and Kalish (1956) Reinforced Pigeons for Pecking a Particular