Actually, quite a bit. Alan Turing, one of the founders of computer science, predicted that by the year 2000, computers would be able to pass the Turing test at a reasonably sophisticated level and that the average interrogator would not be able to identify the computer correctly more than 70% of the time after a five-minute conversation. Although AI hasn’t exactly lived up to Turing’s claims, it has made significant advances, including:
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IBM, Dragon, and Lernout & Hauspie have all deployed voice dialogue systems.
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Banks employ financial software to monitor credit card transactions for odd trends that might indicate fraud. It is projected that a single piece of software will save banks $500 million each year.
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Expert systems/case-based reasoning applications: a computerized Leukemia diagnosis system performed better than human experts in detecting blood diseases.
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Environment Canada used machine translation technologies created in the 1970s to convert natural language weather predictions from English to French. It’s rumoured that it’s still in use.