Scientists have created a "sixth sense" by creating a brain implant through which infrared light can be detected.
Although the light could not be seen lab rats were able to detect it via electrodes in the part of the brain responsible for their sense of touch.
Similar devices have previously been used to make up for lost capabilities, for example giving paralysed patients the ability to move a cursor around the screen with their thoughts.
But the new study, by researchers from Duke University in North Carolina, is the first case in which such devices have been used to give an animal a completely new sense.
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