OpenViBE Objectives : The goal of this demonstration is to show how foot movements (real or imaginary) can be measured in the brain activity and used as a basis for a Brain Computer Interface (BCI) to interact with an object in a virtual environment. In order to achieve this, the power of the brain signal is measured on Cz electrode (located on the top of the head) in the beta frequency range (16-24 Hz) and used as the control signal The Tie fighter demo: may the force be with you… (dark side version) Demonstration sequence : 1. Base line: the subject is requested not to do any particular task and to relax. His/her brain activity is measured in order to calibrate the system. 2. Real foot movements: the subject is requested to perform real foot movements. When he stops, the Tie Fighter (should) lift up. 3. Imaginary foot movements: the subject is requested to imagine foot movements (the neurophysiological phenomenon involved being the same as for real movements). When he stops, the Tie Fighter (should) lift up. What happens ? Foot movements involves beta activity modifications around the Cz electrode. When the user moves or even imagines moving his/her feet, the beta power goes down slowly. A short time after the user stops the movement, there is a burst of beta activity. This measure is used to lift the Tie Fighter. This behavior of the brain activity is common to most people. It can be used as a basis for a BCI system. Contact : Project coordinator: [email protected] Technical contact: [email protected] Website: http://www.irisa.fr/bunraku/OpenViBE This work was supported by the French National Research Agency (ANR) within the Open-ViBE project and grant ANR05RNTL01601.

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This work was supported by the French National Research Agency ( ANR ) within the Open-ViBE project and grant ANR05RNTL01601. OpenViBE. The Tie fighter demo: may the force be with you… ( dark side version ). Objectives : - PowerPoint PPT Presentation

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OpenViBE

Objectives :The goal of this demonstration is to show how foot movements (real or imaginary) can be measured in the brain activity and used as a basis for a Brain Computer Interface (BCI) to interact with an object in a virtual environment.

In order to achieve this, the power of the brain signal is measured on Cz electrode (located on the top of the head) in the beta frequency range (16-24 Hz) and used as the control signal

The Tie fighter demo:may the force be with you… (dark side version)

Demonstration sequence :1. Base line: the subject is requested not to do any particular task and to relax. His/her brain activity is measured in order to calibrate the system.

2. Real foot movements: the subject is requested to perform real foot movements. When he stops, the Tie Fighter (should) lift up.

3. Imaginary foot movements: the subject is requested to imagine foot movements (the neurophysiological phenomenon involved being the same as for real movements). When he stops, the Tie Fighter (should) lift up.

What happens ?Foot movements involves beta activity modifications around the Cz electrode. When the user moves or even imagines moving his/her feet, the beta power goes down slowly. A short time after the user stops the movement, there is a burst of beta activity. This measure is used to lift the Tie Fighter.

This behavior of the brain activity is common to most people. It can be used as a basis for a BCI system.

Contact :Project coordinator: [email protected] contact: [email protected]: http://www.irisa.fr/bunraku/OpenViBE

This work was supported by theFrench National Research Agency (ANR)within the Open-ViBE project and grant

ANR05RNTL01601.