Here's What Happened to People's Brains After Receiving a Robotic 'Third Thumb' 21 MAY 2021 New research with an artificial robotic digit has yielded surprising results - in just a few days, people using the thumb were able to operate it naturally to perform complex tasks like building towers from wooden blocks, or stirring your coffee while holding it.
Not only that, but neural scans showed that the presence of the 'third thumb' had actually changed what was going on in the brain, even when the extra appendage was taken off: having a robo-thumb attached for a few days shifted the brain's representation of flesh and blood fingers.