Posts Tagged ‘online optical illusion’

Bezold Effect in Online Optical Illusion

Wednesday, March 25th, 2009

Psychological Articles Explaining Online Optical Illusions

By Boomeryearbook.com

The Bezold Effect is one of the classical optical illusions which has become the basis of many online optical illusions. Wilhelm von Bezold, a German professor of meteorology, discovered this effect in the nineteenth century. According to this effect, the perception of color brightness changes with respect to adjacent colors. You can find this effect in many online optical illusions that trick observers into believing that a color in the illusion changes.

According to the Bezold Effect, lighter colors look darker and dimmer when placed in adjacent to lighter colors and they look brighter when placed adjacent to darker colors. On the other hand, darker colors become sharper and lighter when placed in adjacent to lighter colors and vice versa. Creators of online optical illusions use this phenomenon to create many great optical illusionary effects.

Bright Color Against Bright and Dull Backgrounds

Figure 1 is a demonstration of one of the online optical illusions based on this effect.

bezold-effect_online-optical-illusion-o1
Figure 1

In this online optical illusion, the red strips with the black background looks brighter than the red strips with the white background. Look again at the red strip at the border between the white and the black background. You will notice that the red strips are actually of same brightness! The trick in this online optical illusion lies in the Bezold Effect due to the differences in background.

There is a wide range of online optical illusions that are based on this effect.

Figure 2 shows another online optical illusion that applies the Bezold Effect.

Dull Color against Bright and Dull Backgrounds
bezold-effect_online-oftical-illusion-o2
Figure 2

In this online optical illusion, the gray line looks dimmer against the dull green background, whereas it looks brighter against the bright purple background. This is because both the green and the gray colors in this online optical illusion are dull colors. On the other hand, the dull gray line becomes brighter due to the bright purple background.

Both the above online optical illusions work on the principle of Bezold Effect, as this amazing effect has enabled the creation of many fascinating online optical illusions presented in previous Boomer Yearbook articles.

Boomer Yearbook is Psychological Articles for Baby Boomers. Connect with old and new friends, or expand your mind and ward off senior moments and elderly problems with dream analysis and online optical illusions and brain games provided by clinical psychologist Dr. Karen Turner. Join other Baby Boomers to stay informed, receive weekly Newsfeeds, and let your opinions be heard. Baby boomers changed the world. We’re not done yet!

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Online Optical Illusion: Café Wall Illusion

Wednesday, March 25th, 2009

Psychological Articles Explaining Online Optical Illusions

By Boomeryearbook.com

Café Wall Illusion is a classical online optical illusion; reported in 1979 by Professor Richard L. Gregory and Priscilla Heard of The University of Bristol, England. They derived this pattern from a pile of white and black ceramic tiles on the front wall of a café at St Michael’s Hill, Bristol. Later, this pattern became a very popular online optical illusion. This online optical illusion is another example of the limitations in the human optical system, leading the brain to form deceptive impressions.

cafe-wall-illusion_online-optical-image-n

In this optical illusion, your see rows of alternate black and white blocks with gray borders. What do you perceive about the horizontal lines in this online optical illusiononline optical illusion are parallel and straight. Don’t believe us? Measure it yourself by placing a ruler against each line.

Explanation of Café Wall online optical illusion

There are various explanations for the Café Wall online optical illusion. Psychological articles give a neuropsychological explanation suggesting that this online optical illusion results from limitations in the balancing act of the inhibitory and excitatory neurons in the brain. Psychological articles inform us that inhibitory neurons dim down perceived bright areas while excitatory neurons brighten perceived dark areas. Hence, in this online optical illusion, the areas in which white is prominent, become dimmed, and the areas surrounded by dark areas are brightened.

Moreover, the limitation in the reaction between the two neurons projects slopes on the straight line. The slopes are in opposite directions according to the dimmed and brightened areas. Hence, you see the straight lines in this online optical illusion to be wavy.

The Café Wall online optical illusion works on the principle of contrast. Along with numerous other online optical illusions explained in Boomer Yearbook that also result from the effect of contrast on the perception of the visual stimulus.

This Psychological Article on Online Optical Illusions is part of Boomer Yearbook’s continuing series of out of the box suggestions on how to alleviate elderly problems and keep our brains young. We believe knowledge is power. We’d love to hear what you think.

Boomer Yearbook is Psychological Articles for Baby Boomers. Connect with old and new friends, or expand your mind and ward off senior moments and elderly problems with dream analysis and online optical illusions and brain games provided by clinical psychologist Dr. Karen Turner. Join other Baby Boomers to stay informed, receive weekly Newsfeeds, and let your opinions be heard. Baby boomers changed the world. We’re not done yet!

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Ambiguous Online Optical Illusions

Wednesday, March 25th, 2009

Psychological Articles Explaining Online Optical Illusions

By Boomeryearbook.com

The Web is a storehouse of a plethora of online optical illusions. These online optical illusions can be categorized into various groups; with Ambiguous online optical illusion being one classification. In ambiguous illusions, the foreground and the background are the main factors that create the deceptive illusion.

Swiss artist Sandro Del-Prete is credited for the creation of some really cool paintings, such as “The Message of Love from the Dolphins”, “Folded Chess Set”, and ‘St. George The Dragon Slayer”. These paintings have become popular online optical illusions that have mesmerized many Web surfers. The online optical illusion “St. George the Dragon Slayer” is a portrait of St. George: Check out the following figure.

st-george-the-dragon-slayer_online-optical-illusion-k
Sandro Del-Prete

If you look carefully at this online optical illusion, you can also see the less obvious fight between St. George and the dragon. Can’t see it? Let me give you a hint. Look at St. George’s hair to see St. George on a horse fighting the dragon.

“St. George The Dragon Slayer” is a wonderful example of an ambiguous online optical illusions; as it shows that an ambiguous online optical illusion is a combination of two actual comprehensible images. It creates an illusion because the human eye focuses on one particular visual element and brings it to the foreground. The other elements act as the background. The brain perceives the image in the foreground while the background acts merely as a complement to the foreground image. By changing the viewer’s focus of sight, (i.e., telling the viewer where to look) you can shift the foreground and the background in ambiguous online optical illusions to see the background image. However, you cannot see both images at the same time. This is where online optical illusions come in.

Sandro Del-Prete has not only created this wonderful painting, “St George The Dragon Slayer”, but the painting is also an online optical illusion that has mesmerized, tricked and amazed human eyes.

This Psychological Article on Online Optical Illusions is part of Boomer Yearbook’s continuing series of out of the box suggestions on how to alleviate elderly problems and keep our brains young. We believe knowledge is power. We’d love to hear what you think.

Boomer Yearbook is Psychological Articles for Baby Boomers. Connect with old and new friends, or expand your mind and ward off senior moments and elderly problems with dream analysis and online optical illusions and brain games provided by clinical psychologist Dr. Karen Turner. Join other Baby Boomers to stay informed, receive weekly Newsfeeds, and let your opinions be heard. Baby boomers changed the world. We’re not done yet!

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