Brownian thought space

Cognitive science, mostly, but more a sometimes structured random walk about things.

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Location: Rochester, United States

Chronically curious モ..

Friday, July 11, 2008


Here's a nice illusion:

Stare at the central dot in the image. 
Wait for the image to switch over to the color-inverted version. Keep staring at the dot.
Now, when the image switches back, you should see a 'normally' colored picture (the colors might be a bit washed out).
But! Look around the pic now - it is still a grayscale image!

How I think it works:
The reversed-color image causes specific (spatially congruent) bits of the retina to adapt to the color at that point. So, when the inverted-color image goes off, you get a recovery, which is the true color, and that 'paints' the grayscale :)

(Photo (c) me)


Anonymous oz said...


July 12, 2008 12:01 PM  

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