GO-STOP Control Using Optical Brain-Computer Interface during Calculation Task

Kei UTSUGI  Akiko OBATA  Hiroki SATO  Ryuta AOKI  Atsushi MAKI  Hideaki KOIZUMI  Kazuhiko SAGARA  Hiroaki KAWAMICHI  Hirokazu ATSUMORI  Takusige KATURA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E91-B   No.7   pp.2133-2141
Publication Date: 2008/07/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.7.2133
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Brain Communication)
Category: 
Keyword: 
NIRS,  optical topography,  brain-computer interface,  brain switch,  prefrontal cortex,  

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Summary: 
We have developed a prototype optical brain-computer interface (BCI) system that can be used by an operator to manipulate external, electrically controlled equipment. Our optical BCI uses near-infrared spectroscopy and functions as a compact, practical, unrestrictive, non-invasive brain-switch. The optical BCI system measured spatiotemporal changes in the hemoglobin concentrations in the blood flow of a subject's prefrontal cortex at 22 measurement points. An exponential moving average (EMA) filter was applied to the data, and then their weighted sum with a task-related parameter derived from a pretest is utilized for time-indicated control (GO-STOP) of an external object. In experiments using untrained subjects, the system achieved control patterns within an accuracy of 6 sec for more than 80% control.