The brain and illusions
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The brain and illusions
What can illusions teach us about the brain?
Curated by Gerald Carey
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Spooky Science: Make a Ghostly Illusion: Scientific American

Spooky Science: Make a Ghostly Illusion: Scientific American | The brain and illusions | Scoop.it
A visual Halloween trick from Scientific American...
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New Scientist TV: Friday Illusion: Ghostly spiral appears from nowhere

Don't worry, the mesmerising swirls in this video won't hypnotise you. But once the moving pattern disappears, you may be surprised when a ghostly spinning spiral appears before your eyes.

The illusion was accidentally discovered by game designer Hjalmar Snoep while he was creating an animation late at night. "I realised that the after-image that appeared wasn't part of the animation," he says. "I've never come across a moving after-image even though I have collected lots of optical illusions, so it piqued my interest."

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New Scientist TV: Friday Illusion: Size trick alters vivid apparition

An illusion that tricks your brain twice is helping to uncover how we perceive ghostly images. The new animation, created by Irene Sperandio from the University of Western Ontario in London, Canada, and colleagues, combines an after-image effect with a common size illusion to investigate how these colourful apparitions are generated.

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