John F. Sowa wrote:
> vQ> http://www.post-gazette.com/pg/06256/721190-114.stm
> > I can't find serious scientific publications on this...
> > [the alleged tetrachromatic ability of some females].
> You can check Google for color perception in reptiles and birds
> (which have 4 color receptors). Mammals evolved from reptiles,
> but they lost two out of the four receptors because they became
> nocturnal to avoid getting eaten by dinosaurs. That meant they
> needed more rods, which are more sensitive to low light levels
> than cones, which distinguish colors. Therefore, most mammals
> are green-red color blind.
> Since the primates took to the trees, they became diurnal, and they
> needed good vision to see which branch to grab. They evolved a
> third receptor, which is encoded on the X chromosome. Since males
> only have one X chromosome, they are more likely to be green-red
> color blind. If any people have more acute color sensitivity,
> they're likely to be female (or interior decorators). (01)
yes yes. i meant i wanted scientific publications about tetrachromacy
in humans. (02)
one remark: cones do not distinguish colors. (03)
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