Comparison of adaptive features with linear discriminant classifier for brain computer interfaces

Many Brain-computer Interfaces (BCI) use bandpower estimates with more or less subject-specific optimization of the frequency bands. However, a number of alternative EEG features do not need to select the frequency bands; estimators for these features have been modified for an adaptive use. The popular band power estimates were compared with Adaptive AutoRegressive parameters, Hjorth, Barlow, Wackermann, Brain-Rate and a new feature type called Time Domain Parameter. The results from 21 subjects show that several features provide an equally good or even better performance, while no subject-specific opthnization is needed, and they are also preferable to band power when the most discriminating frequency band of a subject is not known