How the brain and eyes interpret color

How exactly does the eyes and the brain interpret and process different colors?

How we see and interpret color is probably something that you have never really thought about before, we all take it for granted but it’s actually a very interesting and complex process.

The process of seeing color

Light enters our retina, the light is absorbed by the photoreceptor cells which converts light to electrochemical signals. There are two types of electrochemical signals, we have Rods and Cones. Rods are situated on the outside of the retina and help us to see better at night and they are responsible for our peripheral vision.

The cone cells are more in the center of the retina and allow for more focused vision, for example viewing details and reading. Cones are also responsible for us being able to see different colors.

How cone cells help with seeing color    

Every color that exists is made up of a combination of the three main primary colors of light. These are, Red, Blue and Green. The reason why these three colors are the primary colors is because they are actually the only three colors that we can detect. We have three types of cones that detect wavelengths, these wavelengths are Long – Red, Middle – Green, Short – Blue.

Colors can be separated into two main types, warm and cool colors. warm colors for example are red, yellow and orange. Cool colors for example are blue and green. Our eyes can detect more warm colors than cool colors, this is because the majority of the cones in our retinas are designed to detect warm colors. The difference is about 60 percent are warm color detecting cones and 40 percent for detecting cool colors.

A study conducted by Newton discovered that an object itself either absorbs or reflects color. White is the absence of color because it reflects all colors, black objects absorb all colors in equal amounts which creates the color black. So a blue object is reflecting blue and absorbing all other colors. You only see the reflected color or wavelengths.

Color blindness

Color blindness happens when there is a problem with one or more of the cone pigments which detect the different color wavelengths. The type of color blindness can range from mild to severe, complete or total color blindness does exist however it is very rare.

Men are more prone to suffering with some sort of color blindness. Around 7 percent of men compared to only around 1 percent of women have trouble differentiating between and seeing different colors.

How does the brain deal with this information

When the information reaches the brain it is separated into different pathways. The visual information transfers to retinal ganglion cells and then passes to the geniculate nucleus and continues to the primary visual cortex. The primary visual cortex is the area that allows you to interpret and distinguish between different colors.

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