Mirror neurons were discovered over twenty years ago in the ventral premotor region F5 of the macaque monkey. Since their discovery much has been written about these neurons, both in the scientific literature and in the popular press. ⋯ Indeed so much has been written about mirror neurons that last year they were referred to, rightly or wrongly, as "The most hyped concept in neuroscience". Here we try to cut through some of this hyperbole and review what is currently known (and not known) about mirror neurons.
Sobell Department of Motor Neuroscience and Movement Disorders, UCL Institute of Neurology, London, UK, WC1N 3BG. Electronic address: j.kilner@ucl.ac.uk.