A robot developed by Japanese scientists is so fast it can "win" the rock-paper-scissors game against a human every single time.
Version two completes its chosen hand shape almost at the same time as the human hand.
It uses high-speed recognition and reaction, rather than prediction.
Technically, the robot cheats because it reacts extremely quickly to what the human hand is doing rather than making a premeditated simultaneous action as the rules state.
Taking just one millisecond (ms) - a thousandth of a second - to recognise what shape the human hand is making, it then chooses a winning move and reacts at high speed.
Version one completed its shape 20ms after the human hand; version two finishes almost simultaneously.
The scientists at the Ishikawa Oku Laboratory, part of the University of Tokyo, specialise in a range of technologies, including "sensor fusion", which aims to replicate and improve upon the human senses using high-speed intelligent robots.
But Sethu Vijayakumar, professor of robotics at Edinburgh University says : These robots are really fast at reaction, but there are scenarios where even a millisecond's delay is not acceptable, such as accident avoidance or virtual stock markets.
"In these cases we need to combine high-speed reaction with high-speed prediction, using game theory and behaviour patterning."
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