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#1
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What do dogs REALLY see?
I was just playing "find the Duck" with Tuck. I hide the duck REALLY well
expecting him to use his nose to find it. (I hid it in a closed cupboard) After searching for awhile and not finding it, he started bringing me everything yellow in the room. I know dogs do not have the color cones in their eyes to see yellow. His Duck is Yellow. So why was it he was only selecting yellow items? If you have a black and white picture, you cannot tell which items are yellow (vs a tan) so what do dogs see? |
#2
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What do dogs REALLY see?
in thread : diddy
whittled the following words: I was just playing "find the Duck" with Tuck. I hide the duck REALLY well expecting him to use his nose to find it. (I hid it in a closed cupboard) After searching for awhile and not finding it, he started bringing me everything yellow in the room. I know dogs do not have the color cones in their eyes to see yellow. His Duck is Yellow. So why was it he was only selecting yellow items? If you have a black and white picture, you cannot tell which items are yellow (vs a tan) so what do dogs see? I've been corrected, Dogs CAN see yellow Dogs can see colors, not like how human see colors. http://www.puplife.com/dogcaretips/h...seecolors.html These experiments showed that dogs do see color, but in a more limited range than that seen by normal humans, who see the rainbow of colors described by "VIBGYOR": Violet, Indigo, Blue, Green, Yellow, Orange, and Red (plus hundreds of variations on these shades). Instead, dogs see "VIBYYYR" (Violet, Indigo, Blue, Yellow, Yellow, Yellow, and Red). The colors Green, Yellow, and Orange all look alike to dogs; but look different from Red and different from the various Blues and Purples. Dogs are very good at telling different shades of VIB apart. Finally, Blue-Green looks White to dogs. The simple explanation for these differences in color vision is this. The retinas of normal humans have three (3) types of color receptors, called "cones". Each cone type is particularly sensitive to light of a narrow limit within the entire VIBGYOR range. That means that three different "cone lines" of communication run back to the visual part of the brain, which then compares the weight of the signals coming in from each of cone "line". Different weights produce a perception of different colors. In dogs (and in "green-blind" humans), there are only two (2) types of cones, so there is less basis for comparison by the brain, and thus the perceived color range is more limited. In sum, dog color vision is "color-limited", not "color-blind". |
#3
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What do dogs REALLY see?
This is very useful for people that don't know about dogs vision but I'm a
bit surprised you didn't know the basics of this. Vision and hearing etc is one of the first things you learn when studying behaviour of any animal including humans. -- Alison "diddy" wrote in message ... in thread : diddy whittled the following words: I was just playing "find the Duck" with Tuck. I hide the duck REALLY well expecting him to use his nose to find it. (I hid it in a closed cupboard) After searching for awhile and not finding it, he started bringing me everything yellow in the room. I know dogs do not have the color cones in their eyes to see yellow. His Duck is Yellow. So why was it he was only selecting yellow items? If you have a black and white picture, you cannot tell which items are yellow (vs a tan) so what do dogs see? I've been corrected, Dogs CAN see yellow Dogs can see colors, not like how human see colors. http://www.puplife.com/dogcaretips/h...seecolors.html These experiments showed that dogs do see color, but in a more limited range than that seen by normal humans, who see the rainbow of colors described by "VIBGYOR": Violet, Indigo, Blue, Green, Yellow, Orange, and Red (plus hundreds of variations on these shades). Instead, dogs see "VIBYYYR" (Violet, Indigo, Blue, Yellow, Yellow, Yellow, and Red). The colors Green, Yellow, and Orange all look alike to dogs; but look different from Red and different from the various Blues and Purples. Dogs are very good at telling different shades of VIB apart. Finally, Blue-Green looks White to dogs. The simple explanation for these differences in color vision is this. The retinas of normal humans have three (3) types of color receptors, called "cones". Each cone type is particularly sensitive to light of a narrow limit within the entire VIBGYOR range. That means that three different "cone lines" of communication run back to the visual part of the brain, which then compares the weight of the signals coming in from each of cone "line". Different weights produce a perception of different colors. In dogs (and in "green-blind" humans), there are only two (2) types of cones, so there is less basis for comparison by the brain, and thus the perceived color range is more limited. In sum, dog color vision is "color-limited", not "color-blind". |
#4
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What do dogs REALLY see?
Alison wrote:
This is very useful for people that don't know about dogs vision but I'm a bit surprised you didn't know the basics of this. Vision and hearing etc is one of the first things you learn when studying behaviour of any animal including humans. When I first took a college course in ethology and animal behavior (back in 1969, that was), dogs could not see in color. Nor could most non-primate mammals. The discovery that dogs not only have the equipment (cones) to see in color, but could behaviorally discriminate between different colors (when brightness was held constant or made irrelevant to the discrimination), was made sometime later. (Either that, or my instructor and textbook hadn't caught up with the research. Which wouldn't be surprising. Many (most?) anatomy textbooks don't discuss "nerve zero," the 13th cranial nerve.) So if diddy's experience was anything like my own, canine vision could actually have one of the first aspects of canine behavior that she studied. G FurPaw -- My family values don't involve depleted uranium. To reply, unleash the dog. |
#5
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What do dogs REALLY see?
in thread : FurPaw
whittled the following words: Alison wrote: This is very useful for people that don't know about dogs vision but I'm a bit surprised you didn't know the basics of this. Vision and hearing etc is one of the first things you learn when studying behaviour of any animal including humans. When I first took a college course in ethology and animal behavior (back in 1969, that was), dogs could not see in color. Nor could most non-primate mammals. The discovery that dogs not only have the equipment (cones) to see in color, but could behaviorally discriminate between different colors (when brightness was held constant or made irrelevant to the discrimination), was made sometime later. (Either that, or my instructor and textbook hadn't caught up with the research. Which wouldn't be surprising. Many (most?) anatomy textbooks don't discuss "nerve zero," the 13th cranial nerve.) So if diddy's experience was anything like my own, canine vision could actually have one of the first aspects of canine behavior that she studied. G FurPaw Thank you. I truly believed dogs were color blind, although I was aware that there were a few shades of color dogs could see. I was not aware that they could see as much color as the Tuck indicated. When he was frustrated because he could not find his yellow duck, and started bringing me everything yellow in the room, I knew immediately that I HAD to look up what the latest in Dog color detection was. Something just wasn't right here.He brought me a yellow pen (marker), a yellow work glove, a yellow envelope, and a yellow piece of paper. But NOT his yellow duck. Which indicates to me he has a training problem, he thinks I'm asking him to find something YELLOW. So I'm going to handle some of his other toys, let him hold them, and send him to find those until he realizes I'm asking him to find articles of certain SCENT, and not colors. |
#6
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What do dogs REALLY see?
diddy wrote:
a yellow pen (marker), Ha! Did you read the great pen debate? -- Shelly http://www.cat-sidh.net (the Mother Ship) http://esther.cat-sidh.net (Letters to Esther) |
#7
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What do dogs REALLY see?
On Thu, 15 Mar 2007 09:14:42 -0600, FurPaw
wrote: [...] When I first took a college course in ethology and animal behavior (back in 1969, that was), dogs could not see in color. Nor could most non-primate mammals. Oh my God. Was the "consensus" opinion proven wrong? How can that be? It was the *consensus*!!! Heh. -- Handsome Jack Morrison Scientists threatened with death for 'climate denial'! http://www.telegraph.co.uk/news/main.../ngreen211.xml The Great Global Warming Swindle - the video: http://video.google.ca/videoplay?doc...global+warming Why so much medical research is rot: http://www.economist.com/science/dis...ory_id=8733754 |
#8
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What do dogs REALLY see?
diddy wrote:
Sure did and I was thinking of just writing pen, and let people think he brought me a play pen. snort -- Shelly http://www.cat-sidh.net (the Mother Ship) http://esther.cat-sidh.net (Letters to Esther) |
#9
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What do dogs REALLY see?
montana wildhack wrote:
Yabbut, we still have that big fabric pop-up crate, and Miss Bella learned how to be inside it and walk it end-over-end down a hall, so it would be quite possible for her to "bring her play-pen." Exactly. It could happen, so specificity is good. Also, the above requires video documentation. And didn't you have at least one dog who would pick up straight pins / needles? Not that I recall. Or do you mean Diddy? -- Shelly http://www.cat-sidh.net (the Mother Ship) http://esther.cat-sidh.net (Letters to Esther) |
#10
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What do dogs REALLY see?
in thread news:2007031512585975249-montana@wildhackcominvalid: montana
wildhack whittled the following words: On 2007-03-15 12:51:04 -0400, Shelly said: diddy wrote: Sure did and I was thinking of just writing pen, and let people think he brought me a play pen. snort Yabbut, we still have that big fabric pop-up crate, and Miss Bella learned how to be inside it and walk it end-over-end down a hall, so it would be quite possible for her to "bring her play-pen." And didn't you have at least one dog who would pick up straight pins / needles? Tuck, Reka and Danny all bring/brought/picked up straight pins,needles,razor blades. But a written pin, is completely different than the written pen. (and to me, they don't even sound the same) otoh pen (ink) pen (marking) pen (play) pen (verb) and the list goes on and on, is very difficult to distinguish, sometimes even in written context unless there is a descriptor identifying what you are talking about. |
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