Journal
SOFT COMPUTING
Volume 20, Issue 8, Pages 3085-3096Publisher
SPRINGER
DOI: 10.1007/s00500-015-1937-5
Keywords
Adaptive learning; Brain-computer interfaces; Covariate shift-detection; Transductive learning
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Funding
- Ulster University Vice-Chancellor's research scholarship (VCRS)
- Northern Ireland Functional Brain Mapping Facility project - InvestNI [1303/101154803]
- Ulster University
- UKIERI DST Thematic Partnership project [UKIERI-DST-2013-14/126]
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A common assumption in traditional supervised learning is the similar probability distribution of data between the training phase and the testing/operating phase. When transitioning from the training to testing phase, a shift in the probability distribution of input data is known as a covariate shift. Covariate shifts commonly arise in a wide range of real-world systems such as electroencephalogram-based brain-computer interfaces (BCIs). In such systems, there is a necessity for continuous monitoring of the process behavior, and tracking the state of the covariate shifts to decide about initiating adaptation in a timely manner. This paper presents a covariate shift-detection and -adaptation methodology, and its application to motor imagery-based BCIs. A covariate shift-detection test based on an exponential weighted moving average model is used to detect the covariate shift in the features extracted from motor imagery-based brain responses. Following the covariate shift-detection test, the methodology initiates an adaptation by updating the classifier during the testing/operating phase. The usefulness of the proposed method is evaluated using real-world BCI datasets (i.e. BCI competition IV dataset 2A and 2B). The results show a statistically significant improvement in the classification accuracy of the BCI system over traditional learning and semi-supervised learning methods.
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