Why Color?

Most recent answer: 10/22/2007

Q:
Why do we see color?
- Kristin Farley (age 13)
tuffree middle, California
A:
I’m not sure if you meant to ask about why we see color or really meant to ask how we see color- what’s the mechanism?
The mechanism involves three different types of cells in the eye, sensitive to different colors of light. Your brain registers how much each of those types of cells is firng.

The reason for the body to have such a fancy mechanism seems fairly clear. Seeing in color makes it much easier to distinguish different types of plants, to spot hidden prey and hidden predators, etc. Any of our ancestors who had a little bit of those abilities would have a better chance to survive than ones who didn’t. The abilities themselves are strongly guided by genetic heredity. So pretty soon the survivng ancestors could distinguish colors much better than earlier ancestors. Those of us around now generally have good color vision, although there are some color-blind or partially color-blind people.

Mike W.

(published on 10/22/2007)