OpenViBE

1. 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 : • 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 • 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:anatole.lecuyer@irisa.fr • Technical contact:yann.renard@irisa.fr • Website:http://www.irisa.fr/bunraku/OpenViBE