Nat. Neurosci. 5, 1256–1257 (2002).

The author apologizes for the error in the affiliation mentioned in this News and Views, which should be the Unité de Neurosciences Intégratives et Computationnelles, CNRS, 1 Avenue de la terrasse, 91198 Gif-sur-Yvette, France. Please note that he will move in January 2003 to the Laboratoire Neurophysique et Physiologie du Systeme Moteur, CNRS, 45 rue des Saint-Peres 75270 Paris Cedex 06, France, where correspondence should be thereafter directed.