Erratum to: J Neural Transm DOI 10.1007/s00702-014-1304-1

The original version of this article unfortunately contained a mistake. The affiliation of Dr. Piero Parchi is incorrect. The correct affiliation should be:

P. Parchi

Department of Biomedical and Neuromotor Sciences, University of Bologna and IRCCS Istituto delle Scienze Neurologiche, Bologna, Italy