Using Rest Class and Control Paradigms for Brain Computer Interfacing

Authors:
Siamac Fazli;Márton Danóczy;Florin Popescu;Benjamin Blankertz;Klaus-Robert Müller
Affiliations:
Berlin Institute of Technology, Machine Learning group, Berlin;Berlin Institute of Technology, Machine Learning group, Berlin;IDA group, Fraunhofer FIRST, Berlin;Berlin Institute of Technology, Machine Learning group, Berlin and IDA group, Fraunhofer FIRST, Berlin;Berlin Institute of Technology, Machine Learning group, Berlin
Venue:
IWANN '09 Proceedings of the 10th International Work-Conference on Artificial Neural Networks: Part I: Bio-Inspired Systems: Computational and Ambient Intelligence
Year:
2009

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Abstract

The use of Electro-encephalography (EEG) for Brain Computer Interface (BCI) provides a cost-efficient, safe, portable and easy to use BCI for both healthy users and the disabled. This paper will first briefly review some of the current challenges in BCI research and then discuss two of them in more detail, namely modeling the "no command" (rest) state and the use of control paradigms in BCI. For effective prosthetic control of a BCI system or when employing BCI as an additional control-channel for gaming or other generic man machine interfacing, a user should not be required to be continuously in an active state, as is current practice. In our approach, the signals are first transduced by computing Gaussian probability distributions of signal features for each mental state, then a prior distribution of idle-state is inferred and subsequently adapted during use of the BCI. We furthermore investigate the effectiveness of introducing an intermediary state between state probabilities and interface command, driven by a dynamic control law, and outline the strategies used by 2 subjects to achieve idle state BCI control.