Humans see colour differently in the summer with yellow seeming more green than in the winter months, scientists have shown for the first time. Researchers at York University looked at how colour perception changes between seasons and in particular how humans process the colour known as unique yellow.
Humans identify four unique hues - blue, green, yellow and red - that do not appear to contain mixtures of other colours. Unique yellow is particularly interesting to scientists as it is stable across large populations - everyone agrees what unique yellow looks like despite the fact that people's eyes are often very different.
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