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For decades, economists have tried to guess central bank policy direction by studying subtle changes in official language — now, researchers are finding new clues on policy, not in the words of central bankers but in their faces.

In Japan, two artificial intelligence researchers, one from Nomura Securities and the other from Microsoft, are using software to analyze split-second changes in the facial expressions of Bank of Japan Gov. Haruhiko Kuroda at his post-meeting news conferences.

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