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4 color "sensors" of the eye?

Vay
in Anatomy, Physiology and Neuroscience

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My teacher told me that he read some news about some women having 4 types of color "sensors". I hadn't bothered to ask him to define this phenomenon more specifically. So basically, the average person has 3 color sensors, which are the three primary colors of additive color theory. So what is this 4th color sensor?

 

I couldn't find the news on this, so hopefully someone here knows the source of this news.

Edited by Vay

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