Picture puzzles separate human from machine

July 15, 2010 | Source: New Scientist Tech

Researchers at National Cheng Kung University in Taiwan have developed a tool that camoflages images and could be used to make Captcha images, to ensure that website users signing up for accounts are genuinely people, rather than software bots.

The work fits with the theory that the brain can only be conscious of one visual feature at a glance, but can track the locations of multiple features simultaneously.

Can you find the four hidden animals? (National Cheng Kung University)