Subitizing is our ability to recognise small quantities at a glance, without counting. We can do this with our sense of touch too.
A major drawback to prosthetic limbs is the lack of sensory feedback they provide. “Targeted reinnervation” could provide the answer. This involves taking the nerves that once innervated the severed limb and re-routing them to nearby skin or muscle where they form new connections. “This creates a sensory expression of the missing limb in the amputee’s reinnervated skin. When these individuals are touched on this reinnervated skin they feel as though they are being touched on their missing limb.“