news.bbc.co.uk — Tennis line judges are more likely to make mistakes when calling balls "out" rather than "in", say researchers. Californian scientists found that of 83 incorrect calls, 70 of the errors were wrong "out" calls. This was down to a time lag of a few hundred milliseconds between an image hitting the retina and the viewer processing it, the team said. This bias, revealed in Current Biology, could enable players to exploit the "challenge" system, they suggested.
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