Do animals see like humans? A. Who has pets in our class? - Léana has a cat named Nina. - Tonny has a dog named Harès. Can Nina and Harès see like humans? No, cats and dogs see less colors than humans. See like = voir comme Less than = moins que B. Watch the video to learn about how humans see color. https://www.amnh.org/explore/ology/brain/seeing-color Transcript: Seeing color. What makes the ocean blue? Why does sand look tan? To understand color, we need to know a little bit about light. Light is a kind of wave, just like radio waves. The only difference between radio waves and visible light is the wavelength. X-rays, radio waves, and light waves are all part of the same electromagnetic spectrum. But only certain wavelengths can be detected by the human eye. Each of these wavelengths is a different color. Light from the sun may not seem to have any color. But in fact, every color of the rainbow is already in sunlight. Together they make white light. Sunlight is a mixture of different colors or wavelengths. This mix of colors and white light is what lets us see colored objects. When sunlight hits a beach ball, we see only the light that bounces off of it. Different parts of the ball reflect different colors. The yellow side reflects yellow light. The blue side reflects blue light. The wavelengths that don't bounce off get absorbed as heat. Only the colors that bounce off reach your eyes. The color of light coming from an object is what gives it color. Light travels into the eye to the retina located on the back of the eye. The retina is covered with millions of light sensitive cells called rods and cones. When these cells detect light, they send signals to the brain. Cone cells help detect colors. Most people have three kinds of cone cells. People without all three see fewer colors, sometimes called color blindness. Some cones respond more strongly to blue light. Others pulse faster in response to green. Every color stimulates more than one cone. Their combined response produces a unique signal for each color. Millions of different colors can be distinguished this way. Each cell detects a different part of the picture. Nerve signals from the eye are sent to the brain along the optic nerve. The brain will decode these nerve signals to create a mental image. The optic nerve carries these nerve signals to the visual cortex on the back of the head. The nerve signals arrive in the visual cortex, where an image begins to form. Various parts of the brain analyze color and shape, movement and location, and a conscious perception is created. C. True or False? 1. The colours of the rainbow are RED, ORANGE, YELLOW, GREEN, BLUE, INDIGO, VIOLET (purple). True False 2. Light is a wave, like radio waves or x-ray waves. True 3. Light is part of the electromagnetic spectrum. True 4. You see colours because light reflects from objects. 5. Sight cells are rods and cones. SIGHT = la vue True False False False True False 6. Humans have 3 types of cone cells. True False 7. All humans see colors the same way. True False 8. In English, when you can’t see colors, you are COLORBLIND. 9. White is a combination of many colors of light. True 10. Dark means foncé (dark blue, dark red). True False 11. Light means clair (light blue, light red). True False 12. Mixing many paints makes a dark color. Many = beaucoup, True True False False False makes a = fait une D. Remember the videos. Do animals see like humans? Read and fill in with MORE (plus) or LESS (moins) - Humans see _____________ colors than cats and dogs but ________________ colors than birds. - Humans see __________________ in front than horses. - Humans see _____________ of Earth’s magnetic field than birds. - Flies see ________________ images than humans. - I like ________________ more than red.
