An N200 speller integrating the spatial profile for the detection of the non-control state

The N200 speller is a recently developed non-flashing visual brain-computer interface (BCI) paradigm utilizing the overt attention modulation effects on motion-onset visual evoked potentials (mVEP). In this study, a novel algorithm is proposed and applied in an online N200 speller. The proposed algo...

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Bibliographic Details
Published in:Journal of neural engineering 2012-04, Vol.9 (2), p.026016-1-11
Main Authors: Zhang, Dan, Song, Huaying, Xu, Honglai, Wu, Wei, Gao, Shangkai, Hong, Bo
Format: Article
Language:English
Subjects:
Adult
Algorithms
Artificial Intelligence
Brain - physiology
brain-computer interfaces
Classification
Electroencephalography
Evoked Potentials, Visual - physiology
Female
Human-computer interface
Humans
Male
Modulation
motion-onset visual evoked potentials
Movement - physiology
non-control state
On-line systems
Online
Online Systems
Photic Stimulation
Reproducibility of Results
ROC Curve
spatial profile
Trains
User-Computer Interface
Visual
Young Adult
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Summary:The N200 speller is a recently developed non-flashing visual brain-computer interface (BCI) paradigm utilizing the overt attention modulation effects on motion-onset visual evoked potentials (mVEP). In this study, a novel algorithm is proposed and applied in an online N200 speller. The proposed algorithm integrates the spatial information of the speller matrix to provide a more precise description of the mVEP response patterns, which is defined as the 'spatial profile'. More importantly, only control state data are used in the algorithm to train a classifier that nonetheless can detect the non-control state effectively. Compared to an algorithm with similar structure but not using the spatial profile information, the proposed algorithm shows significantly higher performance for the recognition of the non-control state while achieving a comparable performance for classifying different control states. Offline and online classification results show that the proposed N200 speller is a promising step toward a practical, online non-flashing BCI system for daily use.
ISSN:1741-2560
1741-2552
DOI:10.1088/1741-2560/9/2/026016