FRANCE: What we perceive as the color yellow changes with the seasons, as our world goes from winter grays to summer greens and back again, scientists say.
Researchers at the University of York in Britain working to understand how people process color looked at how humans identify the four primary colors — red, yellow, blue and green — that are considered “unique,” because they do not contain a mixture of other colors.
They focused on unique yellow for its interesting quality of being stable across populations — in other words, all people agree on what that yellow looks like in spite any differences in their visual sense.
The same is not true of unique red, blue or green, making yellow a fascinating research subject, the researchers explain.
They theorized the perception of unique yellow — and any change in that perception — might not depend so much on the biological structure of the human eye but rather on the color of the surrounding natural world.
“What we are finding is that between seasons our vision adapts to changes in environment,” says study leader and psychology doctoral student Lauren Welbourne. “So in summer when there is a much larger amount of foliage, our visual system has to account for the fact that on average we are exposed to far more green.”
In contrast, winter, with its much reduced foliage, appears much more gray, and our vision will compensate so that, surprisingly, it changes what we perceive yellow as looking like.
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