Color and biological interpretation. As an example of biological interpretation of color, imagine loss in the yellow range of wavelength approximately 577 nanometers to 597 nanometers enters the eye and strikes the retina. Light with these wavelengths would activate both the green and the red cones of the retina. According to the light sensitivity curve. The physiological reactions include electrical messages from both the red and the green cones sent to the brain. Then the physiological response and interpretation occurs and the brain recognizes that the light has activated both the red and the green cones and interprets this as meaning the object is the yellow.

In this sense, the color appearance of objects is simply the result of the light from the object stimulating the red and the green cones simultaneously. So with this example in mind, we can begin to understand why secondary colors don't appear to have equal intensity as the primary cause of loss. Because lot is not received by specific yellow canes instead and mix of two types of cones the red and green within the retina.