Robotic 'Third Thumb' use can alter brain representation of the hand Peer-Reviewed Publication University College London image: Designer Dani Clode with her 'Third Thumb' device view more Credit: Dani Clode Using a robotic 'Third Thumb' can impact how the hand is represented in the brain, finds a new study led by UCL researchers. The team trained people to use a robotic extra thumb and found they