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Re: [ontolog-forum] notes and rumours

To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Waclaw Kusnierczyk <Waclaw.Marcin.Kusnierczyk@xxxxxxxxxxx>
Date: Mon, 02 Jul 2007 20:52:55 +0200
Message-id: <46894987.7070400@xxxxxxxxxxx>
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)

vQ    (04)

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