14-11-2012, 06:23 PM
ORDINARY MAN CONTROLLING COMPUTER
1ORDINARY MAN CONTROLLING.pptx (Size: 596.49 KB / Downloads: 30)
BRAIN COMPUTER INTERFACE
THE DEVICE USED FOR INTERFACE IS EEG(Electroencephalography).
THE EEG, OR ELECTROENCEPHALOGRAM, ELECTRICAL ACTIVITY RECORDED FROM THE SCALP AND PRODUCED BY NEURONS IN THE BRAIN.
MOVEMENT RELATED DESYNCHRONIZATIONS
CHANGES OCCUR IN THE EEG WHEN WE PLAN MOVEMENTS.
THESE CHANGES ARE CALLED MOVEMENT-RELATED DESYNCHRONISATIONS
SIGNAL PROCESSING SYSTEM
ALGORITHMS USED
FASTFOURIER TRANSFORM
BANDPASS FILTERING
AUTOREGRESSIVE MODELLING
COMPONENTS IN EEG
The pattern recognition system often used to be composed of a linear classifier such as a logistic discriminant or a classical nonlinear classifier such as the Bayes quadratic classifier or linear vector quantiser (LVQ).
An important characteristic of a BCI system is the speed with which the interface can be used. This can be measured by the `channel capacity'
APPLICATIONS OF BCI
Patient with severe movement disorders: Control external devices (neuroprosthesis, wheelchair) by mental focus.
Entertainment (games)
Military Use (fighter pilots)