Brain-Computer Interfacing (BCI) is a promising technology for patients that are severely motor-disabled, because it enables them to communicate and interact with the environment. A BCI system decodes user's intentions from brain signals, typically recorded with electroencephalography (EEG), and transmits them to a computer application that, e.g., controls a wheelchair. The efficiency of the system largely depends upon a reliable extraction of informative features from the high-dimensional EEG signal. Spatial filtering is a crucial step in this protocol, however, current approaches are prone to errors when data is contaminated by artifacts or is nonstationary. This article provides an overview of a dissertation, which has addressed the problem of robust spatial filtering in BCI. The contributions of the thesis range from the development of regularization schemes and a robust parameter estimator for spatial filtering, to the formulation of an information geometric view on the spatial filtering problem and the proposal of a new family of algorithms based on robust divergences. The developed methods and concepts are applicable to a variety of problems in machine learning and signal processing.
About the author
Dr. Wojciech Samek is head of the Machine Learning group at Fraunhofer Heinrich Hertz Institute and associated researcher at the Berlin Big Data Center. He received the Diploma degree in Computer Science from Humboldt-Universität zu Berlin in 2010 and the Ph.D. degree from the Technische Universität Berlin in 2014. He was scholar of the Studienstiftung des deutschen Volkes and a Ph.D. Fellow at a DFG Research Training Group and the Bernstein Center for Computational Neuroscience Berlin. During his studies he had research stays at the University of Edinburgh, U.K., the NASA Ames Research Center, Mountain View, CA, USA, and ATR International, Kyoto, Japan. His research interests include machine learning, neural networks, signal processing and computer vision.
Fraunhofer Heinrich Hertz Institute, Department of Video Coding & Analytics, D-10587 Berlin, Germany
©2016 Walter de Gruyter Berlin/Boston