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Demonstration of Blind Spot

Demonstration of Blind Spot. J.W. Whitlow Rutgers University. Basic Phenomenon. The next slide has a cross on the left and a circle on the right. Close or cover your left eye, then look at the cross with your right eye.

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Demonstration of Blind Spot

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  1. Demonstration of Blind Spot J.W. Whitlow Rutgers University

  2. Basic Phenomenon • The next slide has a cross on the left and a circle on the right. • Close or cover your left eye, then look at the cross with your right eye. • Move your head slowly either toward the screen or away from the screen, staring at the cross with your right eye, until the circle disappears • When the circle disappears, you have found your right eye’s blind spot.

  3. Variations on Basic Phenomenon • The next slide has a colored background with a brightness gradient that is darker behind the cross and lighter behind the circle • Find your right eye blind spot • Is the brightness at the blind spot darker, like the gradient behind the cross, or lighter, like the gradient behind the circle?

  4. Variations on Basic Phenomenon • The next slide has a cross on the left and a circle on the right • The circle has been marked off by a ring • Find your right eye blind spot • Determine whether or not you can see the ring. If you cannot see the ring, adjust its size to make it larger.

  5. Variations on Basic Phenomenon • The next slide has a cross on the left and a circle on the right • The circle has been marked off by a ring filled with color • Find your right eye blind spot • What color is the area where the circle was before it disappeared?

  6. Variations on Basic Phenomenon • The next slide has a cross on the left and a circle on the right • The circle has been marked off by a ring filled with a textured coloring • Find your right eye blind spot • What texture is the area where the circle was before it disappeared?

  7. Variations on Basic Phenomenon • The next slide has a cross on the left and a circle on the right • The circle has been marked off by a ring filled with colored stripes • Find your right eye blind spot • What happens to the lines that go through the blind spot?

  8. Variations on Basic Phenomenon • The next three slides have a cross on the left and a circle on the right • The circle has been marked off by a ring filled with a color • The ring around the circle is smaller in each of the slides • Find your right eye blind spot • What happens as the ring gets smaller?

  9. Concluding Remarks • What do your observations suggest about the visual processing mechanisms that produce the blind spot?

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