“A tiny group of people can see ‘invisible’ colours that no-one else can perceive, discovers David Robson. How do they do it?”
“Today, she knows that this is a symptom of a condition known as “tetrachromacy”. Thanks to a variation in a gene that influences the development of their retinas, people like Antico can see colours invisible to most of us. Consider a pebble pathway. What appears dull grey to you or me shines like a jeweller’s display to Antico. “The little stones jump out at me with oranges, yellows, greens, blues and pinks,” she says. “I’m kind of shocked when I realise what other people aren’t seeing.””
http://www.bbc.com/future/story/20140905-the-women-with-super-human-vision
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