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The brain and illusions
What can illusions teach us about the brain?
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Ceci n'est pas une spirale

Ceci n'est pas une spirale | The brain and illusions | Scoop.it
That's right, this is not a spiral.  If you check this illusion (from Sean Michael Ragan at Make) with your finger or mouse, you'll find that it's a series of concentric circles. Also, if you move ...
Gerald Carey's insight:

Interesting take down of the above 'spiral'.

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Headache-Inducing Spiral Illusion Explained

Headache-Inducing Spiral Illusion Explained | The brain and illusions | Scoop.it
Scientists explain a notorious optical illusion that confuses the brain into thinking circles are spirals.
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Spiral Illusion

Spiral Illusion | The brain and illusions | Scoop.it

Very nice interactive using the spiral illusion. Would work really well with Interactive White Board.

(Go here: http://www.digitalxpression.co.uk/dwheel.swf if the title does not work)

 

Explanation: "In the 1970's, a number of Psychologists were actively studying the phenomenon. See "The Perception of Moving Targets" by Robert Sekuler and Eugene Levinson, Scientific American, January 1977, page 60. This article gives a physiological explanation: The brain has separate motion detectors for different directions of motion. The motion detectors produce a stronger signal when there is motion and a weaker (but non-zero) signal when there is no motion. As long as all the motion-detectors are in balance with each other, you do not perceive any motion. When strongly stimulated by motion in a particular direction, the subset of motion detectors that respond to that motion become fatigued. When the stimulus is removed, the motion detectors for the opposite direction produce a stronger signal for a few seconds, until the fatigued motion detectors recover. This is thought to be the source of the motion aftereffect."

Source: http://dogfeathers.com/java/spirals.html

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Mesmerizing GIF Prepares Your Eyes To Take In “Bioshock” Optical Illusions

Mesmerizing GIF Prepares Your Eyes To Take In “Bioshock” Optical Illusions | The brain and illusions | Scoop.it
The following image probably looks like a typical bustling day in a subaquatic city.
Gerald Carey's insight:

Nice use of common spiral illusion.

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This weird optical illusion makes a moving spiral appear out of nowhere

This weird optical illusion makes a moving spiral appear out of nowhere | The brain and illusions | Scoop.it
It's not unusual for optical illusions to create afterimages, ghostly reflections that show up after staring at something too long. This particular afterimage is a bit different.
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