Tuesday July 25, 2017


Optical illusion that lasts for days!
  Posted by: Digg on Jul 3rd, 2006 1:00 AM
It is called the McCollough Effect, and was originally described by Celeste McCollough [...] It has been the focus of on-going investigation ever since. The precise cause of the effect is unknown, and currently under investigation. [...] There are neurotransmitters involved and appear to be responsible for the long-lasting nature of the effect.

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