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  

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)
NIRS,  optical topography,  brain-computer interface,  brain switch,  prefrontal cortex,  

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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.