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Line 30: * [[Captcha]] (reverse Turing test) [Lillibridge 98] Automated tests to distinguish a human user from a computer program using open problems in AI that have no suitable algorithmic solutions. In some sense, they are also a reverse of IGA: a computer program generates an image and presents it to an agent for evaluation/classification, but uses a reply of the agent to classify it into human or non-human category. * Interactive online [[guessing game~~\|guessing games~~]]s [Burgener 99, von Ahn 03]: These are programs that extract knowledge from people in an entertaining way. Some of them can be described in terms of HBGA model. ==References==

Human-based computation: Difference between revisions