This is an interesting effect

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This is an interesting effect

Postby Harry Dalek » Sat Jan 20, 2018 9:46 pm

The 'grid' first reported by German physiologist Ludimar Hermann in 1870, and simply involves a white grid on a black background.

As you move your eyes around the image, dark dots quickly appear and disappear at the intersections.

However, whenever you look directly on any intersection, the dark dots vanish.

For years it was widely believed that the illusion worked because of 'lateral inhibition' - the term used to describe the complex way in which the cells on the back of the retina respond to areas of black and white.

The effect seems only to be second lines in ,
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Harry Dalek
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Re: This is an interesting effect

Postby Andrew Davie » Sun Jan 21, 2018 12:43 am

I show optical illusions to school kids when I visit as a scientist-in-schools volunteer thing I do. This is one of them.
For my eyes, I'm approximately a 4 (across) x3 (up/down) dot grid where they look normal when I look at this - and the rest with the effect. I also don't see the effect on the edges.
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