Research Papers: Sensing

Evaluation of various mental task combinations for near-infrared spectroscopy-based brain-computer interfaces

[+] Author Affiliations
Han-Jeong Hwang

Hanyang University, Department of Biomedical Engineering, Seoul 133-791, Republic of Korea

Berlin Institute of Technology, Machine Learning Group, Marchstrasse 23, Berlin 10587, Germany

Jeong-Hwan Lim

Hanyang University, Department of Biomedical Engineering, Seoul 133-791, Republic of Korea

Do-Won Kim

Hanyang University, Department of Biomedical Engineering, Seoul 133-791, Republic of Korea

Chang-Hwan Im

Hanyang University, Department of Biomedical Engineering, Seoul 133-791, Republic of Korea

J. Biomed. Opt. 19(7), 077005 (Jul 18, 2014). doi:10.1117/1.JBO.19.7.077005
History: Received February 1, 2014; Revised June 18, 2014; Accepted June 20, 2014
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Abstract.  A number of recent studies have demonstrated that near-infrared spectroscopy (NIRS) is a promising neuroimaging modality for brain-computer interfaces (BCIs). So far, most NIRS-based BCI studies have focused on enhancing the accuracy of the classification of different mental tasks. In the present study, we evaluated the performances of a variety of mental task combinations in order to determine the mental task pairs that are best suited for customized NIRS-based BCIs. To this end, we recorded event-related hemodynamic responses while seven participants performed eight different mental tasks. Classification accuracies were then estimated for all possible pairs of the eight mental tasks (C82=28). Based on this analysis, mental task combinations with relatively high classification accuracies frequently included the following three mental tasks: “mental multiplication,” “mental rotation,” and “right-hand motor imagery.” Specifically, mental task combinations consisting of two of these three mental tasks showed the highest mean classification accuracies. It is expected that our results will be a useful reference to reduce the time needed for preliminary tests when discovering individual-specific mental task combinations.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Han-Jeong Hwang ; Jeong-Hwan Lim ; Do-Won Kim and Chang-Hwan Im
"Evaluation of various mental task combinations for near-infrared spectroscopy-based brain-computer interfaces", J. Biomed. Opt. 19(7), 077005 (Jul 18, 2014). ; http://dx.doi.org/10.1117/1.JBO.19.7.077005


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