Selection of electrode positions for an EEG-based brain computer interface (BCI)
Pregenzer, M.; Pfurtscheller, G.; Flotzinger, D.
Biomedizinische Technik. Biomedical Engineering 39(10): 264-269
1994
ISSN/ISBN: 0013-5585 PMID: 7811910 Document Number: 425389
One major question in designing an EEG-based Brain Computer Interface to bypass the normal motor pathways is the selection of proper electrode positions. This study investigates electrode selection with a Distinction Sensitive Learning Vector Quantizer (DSLVQ). DSLVQ is an extended Learning Vector Quantizer (LVQ) which employs a weighted distance function for dynamical scaling and feature selection. The data analysed and classified were 56-channel EEG recordings over sensorimotor areas during preparation for discrete left or right index finger flexions. Data from 3 subjects are reported. It was found by DSLVQ that the most important electrode positions for differentiation between planning of left and right finger movement overlie cortical finger/hand areas over both hemispheres.