Mirror neurons are premotor neurons, originally discovered in the macaque brain, that discharge both during execution of goal-directed actions and during the observation of similar actions executed by another individual. They therefore 'mirror' others' actions on the observer's motor repertoire. In the last decade an impressive amount of work has been devoted to the study of their properties and to investigate if they are present also in our species. Neuroimaging and electrophysiological techniques have shown that a mirror-neuron system does exist in the human brain as well. Among 'mirror'...