[ SHOWGSD-L ] Re: DOGS DO SEE COLORS

  • From: "arycrest@xxxxxxxxxxx" <arycrest@xxxxxxxxxxx>
  • To: wynsum@xxxxxxx
  • Date: Sat, 7 Oct 2006 16:48:16 GMT

This link was posted on a GSD message board recently - it was published in 1995 
so there may be lmore up-to-date findings..
http://psychlops.psy.uconn.edu/eric/class/dogvision.html
Here's what it says in part:
" A number of studies have been done to investigate the color vision of dogs, 
and the results have been conflicting. However, more recent, better controlled 
studies indicate that dogs do possess and use color vision, but not to the same 
degree that humans do. The photoreceptor used for color vision is the cone, and 
there are cones present in the canine retina. However, they are present in low 
numbers, comprising less than 10% of the total photoreceptor population in the 
central area of the retina, as opposed to the human retina which consists of 
nearly 100% cones in the fovea. Two distinct type of cones appear to be present 
in the canine retina. One type is maximally sensitive to light in the 
wavelength that appears violet to people, and the other type is maximally 
sensitive to light in the wavelength that appears yellow-green to people. Thus, 
it appears that the visual spectrum of color in dogs is divided into two hues; 
one in the violet and blue-violet range, probably appearing as blue, and the 
other in the greenish-yellow, yellow, and red range, which is probably seen as 
yellow. Light that appears blue-green to people probably appears as white or 
shades of gray to dogs. Dogs are unable to differentiate colors that appear as 
green, yellow-green, orange or red to people, and are unable to differentiate 
greenish-blue from gray. This is similar to people who are red-green color 
blind. However, one study indicates that dogs are better able to differentiate 
between subtle shades of gray than people, which would be advantageous in 
increasing visual discrimination in low light conditions, where insufficient 
light is available to stimulate cones. "

Gayle & the Hooligans!
http://www.picturetrail.com/gallery/view?p=6&uid=4294023 - Link to The 
Hooligans Albums

-- "DOC" <wynsum@xxxxxxx> wrote:
If I can find the article, written about 8 yers ago in Dog World, dogs see 
blues and 
greens


Doc Zoe
Wynsum http://wynsumgsd.com
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POST is Copyrighted 2006.  All material remains the property of the original 
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are permitted without prior permission of the original author  AND of the 
Showgsd-l Management. ALL RIGHTS RESERVED. 

ALL PERSONS ARE ON NOTICE THAT THE FORWARDING, REPRODUCTION OR USE IN ANY 
MANNER OF ANY MATERIAL WHICH APPEARS ON SHOWGSD-L WITHOUT THE EXPRESS 
PERMISSION OF ALL PARTIES TO THE POST AND THE LIST MANAGEMENT IS EXPRESSLY 
FORBIDDEN, AND IS A VIOLATION OF LAW. VIOLATORS OF THIS PROHIBITION WILL BE 
PROSECUTED. 

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