OpenViBE

1
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_at_irisa.fr Technical contact
yann.renard_at_irisa.fr Website http//www.irisa.fr
/bunraku/OpenViBE