The Gift of Color Vision
November 18, 2014 admin 3 Comments
There is a rare condition that’s not fatal, but many artists would kill to have it. It is called tetrachomacy. Its main symptom is near-superhuman vision.
Impressionist painter Concetta Antico has tetrachomacy. When she examines a leaf, she sees a “mosaic of color,” not just shades of green.
“Around the edge I’ll see orange or red or purple in the shadow; you might see dark green but I’ll see violet, turquoise, blue,” she says. In her line of work, this ‘disorder’ is a rare gift that produces extraordinary works of art.
Tetrachromats have more receptors in their eyes to absorb color, letting them see hues that are invisible to everyone else. The average person has three cones, or photoreceptor cells in the retina that control color vision and allow people to see up to a million colors. Tetrachromats have four cones, so they can detect nuances and dimensions of color that others can’t.
Researchers believe that one percent of the world population is tetrachromatic. According to Kimberly Jameson, a cognitive scientist at the Institute for Mathematical Behavioral Sciences at the University of California in Irvine, the differences between the color range perceived by a tetrachromat and someone with normal vision is not as drastic as the difference between someone who is colorblind and someone who is not.
After studying Concetta Antico’s genes, Jameson determined that her fourth cone absorbs color wavelengths that are “reddish-orangey-yellow.” As a cognitive scientist, Jameson is fascinated with how people like tetrachromats can form and communicate concepts, especially since their visual perception of the world is so different.
Research suggests that tetrachromacy may be more widespread than assumed: those who have it don’t always notice because they haven’t trained their brains to pay attention. Antico admits that she was more color-aware than most children; at age seven she was painting and thoroughly fascinated with color. Because of the extensive exposure at an early age, her brain wired itself to notice and take advantage of her tetrachromacy.
She actively supports continued research into mutations that affect color perception. Her reasons are personal: five years ago, her seven-year old daughter was diagnosed as colorblind. Antico believes that the more she helps science professionals understand tetrachromacy, the better they will be able to help her daughter one day.
Kimberly Jameson agrees. “If we understand genetic potential for tetrachromacy and how their perception differs,” she says, “we can understand quite a lot about visual processing of color that we currently don’t understand.”
Antico may actually be helping colorblind individuals via her art. She has been teaching painting for over 20 years, and many of her students have been color-deficient. Jameson has looked at their artwork and found it to be surprisingly color-aware. She believes that Antico’s sensitivity to color differences at a very early age may have given her the understanding and articulation to help these students. It’s a hypothesis that still needs to be proved empirically, but raises the possibility that people’s perception of color can be improved by retraining their brains.
Antico has her own art gallery in San Diego and hopes to one day open an art school for the colorblind, to help them improve their color-awareness.
“What if we tetrachromats can show the way to color for people who are less fortunate than us?” she says. “I want everyone to realize how beautiful the world is.”
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