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Using microchips implanted in their brains to communicate, the rats were able to collaborate and solve simple puzzles, even though in one experiment they were thousands of miles apart.
The first rat, known as the 'encoder', was taught to find water in its cage by responding to a light and pressing a particular lever. Its brain was connected to a second animal, known as the 'decoder', which was not given the light signals... ...the second animal relied solely on the brain instructions, but when stimulated still pressed the right lever to receive a reward 70 per cent of the time - far more often than it would have by chance, demonstrating they had been guided by the other rat's mind.
Evidence from this study suggested that the decoder rat began to develop a double identity, by picking up sensations from two sets of whiskers - its own and those of its partner.