© 2012 Seppänen, Hämäläinen, Pesonen and Tervaniemi. This is an open-access article distributed under the terms of the Creative Commons Attribution Non Commercial License, which permits non-commercial use, distribution, and reproduction in other forums, provided the original authors and source are credited. This Document is Protected by copyright and was first published by Frontiers.
Except where otherwise noted, this item's license is described as © 2012 Seppänen, Hämäläinen, Pesonen and Tervaniemi. This is an open-access article distributed under the terms of the Creative Commons Attribution Non Commercial License, which permits non-commercial use, distribution, and reproduction in other forums, provided the original authors and source are credited. This Document is Protected by copyright and was first published by Frontiers.