Ramachandran continued research by building off the idea of mirror neurons. Mirror neurons are known to fire when an individual watches another move a limb. Ramachandran believed that this visual perception could play an important role in creating the sensation of a movement. He tested his theory by putting a mirror between a patient's arms who had a phantom hand in which he had chronic pain that felt like his hand was always painfully clenched. After he placed the mirror between his hands he asked him to move his phantom and healthy limb simultaneously while looking at the reflection of his healthy limb. This tricked the patient's brain into thinking his phantom hand was moving in a normal way and he felt his phantom clenched fist release. The visual perception is telling your brain your hand is moving.
Those at UCSD are in the early stages of investigating whether or not the mirror therapy can help in easing the pain of those living with osteoarthritis. I think that Ramachandran's theories have led to great discoveries that are benefitting other areas in the medical field. The mirror therapy technique is helping in so many ways.