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Tags: Wheelchair Using Brain Waves


By David Fewster - Worldwidehealth Editor

This article has been viewed 814 times.

Japan's BSI-TOYOTA Collaboration Centre has successfully developed a system that controls a wheelchair using brain waves in as little as 125 milliseconds.

BTCC was established in 2007 by RIKEN, an independent Japanese research institution, as a collaborative project with Toyota Motor Corporation, Toyota Central R&D Labs, Inc., and Genesis Research Institute, Inc.

Recently technological developments in the area of brain machine interface (BMI) have received much attention. Such systems allow elderly or handicapped people to interact with the world through signals from their brains, without having to give voice commands.

BTCC's new system fuses RIKEN's blind signal separation (1) and space-time-frequency filtering (2) technology to allow brain-wave analysis in as little as 125 ms, as compared to several seconds required by conventional methods. Brain-wave analysis results are displayed on a panel so quickly that drivers do not sense any delay. The system has the capacity to adjust itself to the characteristics of each individual driver, and thereby is able to improve the efficiency with which it senses the driver's commands. Thus the driver is able to get the system to learn his/her commands (forward/right/left) quickly and efficiently. The new system has succeeded in having drivers correctly give commands to their wheelchairs. An accuracy rate of 95% was achieved, one of the highest in the world.

Plans are underway to utilize this technology in a wide range of applications centred on medicine and nursing care management. R&D under consideration includes increasing the number of commands given and developing more efficient dry electrodes. So far the research has centred on brain waves related to imaginary hand and foot control. However, through further measurement and analysis it is anticipated that this system may be applied to other types of brain waves generated by various mental states and emotions.

Notes:

(1) Blind signal separation (BSS) is a technology that separates the noise components and useful signal components from brain signals that can be used to control the wheelchair. It utilizes only on-line-recorded EEG signals.

(2) Space-time-frequency filtering is a technology that extracts space and time patterns and frequency oscillation data from EEG electrodes to discriminate significant features and components that are able to reliably control the wheelchair.

Materials supplied by Riken were used in this report

All rights reserved. Any reproducing of this article must have the author name and all the links intact.


David Fewster - Worldwidehealth Editor

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