People who lose a limb often experience the sensation of still having the missing arm or leg. Phantom limbs, in fact, have spurred a whole line of independent research among neuroscientists.
But it appears that all of us may be capable of these sensations, even if arms and legs remain intact. If we can conjure a phantom limb just like that, it raises all kinds of enticing questions for philosophers as well as scientists about what exactly constitutes our perception of the physical self. Karolinska Institute researchers report online in the Journal of Cognitive Neuroscience that they can induce a sensation of a phantom hand in just a short time. Watch this simple experiment here: