1. Laboratory for Advanced Brain Signal Processing, RIKEN Brain Science Institute, Saitama 351-0198, Japan
2. Department of Informatics and Mathematical Modeling, Technical University of Denmark, Richard Petersens Plads, Building 321, 2800 Lyngby, Denmark
3. Advanced Technology Labs, Adobe Systems Inc., 275 Grove Street, Newton, MA 02466, USA
4. Centre for Vision, Speech, and Signal Processing, University of Surrey, Guildford GU2 7XH, UK
5. Institute of Telecommunications, Teleinformatics, and Acoustics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50370 Wroclaw, Poland