Google on a picture-based Captcha!

CAPTCHA - the term is short for “completely automated public Turing test to tell computers and humans apart,” a reference to the test proposed by Alan Turing, the British mathematician, to determine if a computer can be said to think like a human. These are those things you find on Web sites at log-in that require you to decipher and type words or numbers.

Researchers at Google are testing a new captcha that requires people to turn upright randomly rotated images, like that of a parrot perched temporarily upside-down on a leafy branch. The task is a breeze for people — using a cellphone touchscreen, for example, to flip the image — but hard for machines.

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