    \chapter*{Acknowledgments\markboth{Acknowledgments}{Acknowledgments}}
First of all, the author wishes to thank his advisors, Selim Onat for his intense motivation for this project, and Peter K�nig for many hints on various occasions. He is grateful to Frank Schumann and Alper A\c{c}\i{}k for explanations and fruitful discussions; furthermore to Hans-Peter Frey, Lina Jansen, Sonja Schall, and Robert M�rtin for discussions on various topics and their comments, however useful they may have proved; Thanks to Isabel Dombrowe for her patient display of interest in his enthusiastic output of plots. Without them and many others from the Neurobiopsychology Laboratory, who supported him technically and emotionally, he cannot imagine the present work to take shape. He thanks the many participants in his experiment for their endurance during his sometimes clumsy attempts to calibrate them. He also wants to thank his parents Ulrike and Bernhard for their constant support. 


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\chapter*{License}
Copyright \copyright  2006, Benjamin Joachim Auffarth. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License``. The software that was developed in the process of this research is licensed under the GNU General Public License. 
