Nature 468, 696–700 (2010); doi:10.1038/nature09536

In Fig. 2a of this Letter, the neuron reconstruction and the electrophysiology/calcium imaging traces were mismatched. In addition, in Fig. 2c, the wild-type SNc neurons should have been ‘(n = 5)’ rather than ‘(n = 9)’. This was a typographical error, and the figure and error bars remain correct. These have all now been corrected in the online versions of the manuscript.