Showing posts with label blind. Show all posts
Showing posts with label blind. Show all posts
Tuesday, September 11, 2012
Friday, February 24, 2012
Thursday, June 30, 2011
Why?
Why is it illegal to park in a handicapped parking space but okay to go to the bathroom in a handicapped stall? -- Jerry Seinfeld
Would somebody please explain to me those signs that say, "No animals allowed except for Seeing Eye Dogs?" Who is that sign for? Is it for the dog, or the blind person? -- Jerry Seinfeld
Here are a few more Seinfeldisms..
Thursday, May 5, 2011
Can Dogs See Colors?
by Stanley Coren, Ph.D., F.R.S.C. in Canine Corner at Psychology Today Dot Com
Probably one of the most frequently asked questions about dog's vision is whether dogs see colors. The simple answer-namely that dogs are colorblind-has been misinterpreted by people as meaning that dogs see no color, but only shades of gray. This is wrong. Dogs do see colors, but the colors that they see are neither as rich nor as many as those seen by humans.
The eyes of both people and dogs contain special light catching cells called cones that respond to color. Dogs have fewer cones than humans which suggests that their color vision won't be as rich or intense as ours. However, the trick to seeing color is not just having cones, but having several different types of cones, each tuned to different wavelengths of light. Human beings have three different kinds of cones and the combined activity of these gives humans their full range of color vision.
The most common types of human colorblindness come about because the person is missing one of the three kinds of cones. With only two cones, the individual can still see colors, but many fewer than someone with normal color vision. This is the situation with dogs who also have only two kinds of cones.
Jay Neitz at the University of California, Santa Barbara, tested the color vision of dogs. For many test trials, dogs were shown... Click here to continue on to the rest of the article..
Source / Via
Probably one of the most frequently asked questions about dog's vision is whether dogs see colors. The simple answer-namely that dogs are colorblind-has been misinterpreted by people as meaning that dogs see no color, but only shades of gray. This is wrong. Dogs do see colors, but the colors that they see are neither as rich nor as many as those seen by humans.
The eyes of both people and dogs contain special light catching cells called cones that respond to color. Dogs have fewer cones than humans which suggests that their color vision won't be as rich or intense as ours. However, the trick to seeing color is not just having cones, but having several different types of cones, each tuned to different wavelengths of light. Human beings have three different kinds of cones and the combined activity of these gives humans their full range of color vision.
The most common types of human colorblindness come about because the person is missing one of the three kinds of cones. With only two cones, the individual can still see colors, but many fewer than someone with normal color vision. This is the situation with dogs who also have only two kinds of cones.
Jay Neitz at the University of California, Santa Barbara, tested the color vision of dogs. For many test trials, dogs were shown... Click here to continue on to the rest of the article..
Source / Via
Thursday, December 9, 2010
Thursday, July 8, 2010
Dreaming Without Senses
Via
If they're born blind, do they ever "see" anything in their dreams, or is just blackness? Do color-blind people dream in black and white? Do deaf mutes sign in their dreams, especially as babies before they learn the language?
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