1 / 9

Optical illusions

Do you see black dots?. Optical illusions. Does it look like its moving?. By Peggy and Anastasia. What is an optical illusion?.

margot
Télécharger la présentation

Optical illusions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Do you see black dots? Optical illusions Does it look like its moving? By Peggy and Anastasia

  2. What is an optical illusion? An Optical Illusion is an object causing a false visual impression. Like this one for example, it looks like there is a white triangle but it is just a blank space, three V’s and three packman shapes.

  3. Movement of still objects When you look at a still circular object or a spiral, it might appear to be moving, but actually, the brain is just playing tricks on you. This happens because in the visual nervous system there are some cells that respond to specific directions of motion. For example, when a person looks at an object moving upward, such as a fire the persons upward receptors are moving in action. So if the person is looking at this fire for long enough for the cells to become tiered, then looks at a still and simple object such as a building, the building will appear to be moving upwards.

  4. Colors If you look at the box closely, you can see some grey spots at the corners of the boxes. This happens because the contrast is so high that some of your cells in the retina shut down. So the blocking causes the grey spots to appear.

  5. Video http://www.youtube.com/watch?v=p26nNgWAleI&feature=related

  6. Escher’s Waterfall In this illusion the water seems to be moving up. But, gravity says different. The effect of this illusion is generated by conflicting proportions which create a visual paradox. We usually find geometric pictures which are usually informed as brain puzzles or tasks, rather than art.

  7. Negative Illusions After staring at the dot for about 25 seconds the bright colors of the rainbow make your retina be exhausted so the photo respirators stop functioning properly. When the main image appears they have to fit in the new image so they will not be able to perceive the new colors. Now the excited photo receptors are now resting so the ones that were not exited are doing the job. This time the colors are in this original image, but change because this time the brain cells interpret colors in a different way.

  8. More illusions! http://kids.niehs.nih.gov/games/illusions/lots_of_illusions.htm

  9. Acknowledgements For our information: http://www.pbs.org/wnet/brain/illusions/color.html http://www.weirdoptics.com/eschers-waterfall-illusion/ For our pictures: http://www.google.ca/imghp?hl=en&tab=wi For our video http://www.youtube.com/watch?v=p26nNgWAleI&feature=related For the other illusions: http://kids.niehs.nih.gov/games/illusions/lots_of_illusions.htm

More Related