[Todos] Coloquios del Departamento de Física

[Pablo Dmitruk]

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             COLOQUIOS DEL DEPARTAMENTO DE FÍSICA FCEyN - UBA


                         Charla, café y galletitas
                    En el Aula Federman, 1er piso, Pabellón I,
                            Ciudad Universitaria


           Brain-computer interface: Reading the brain in real-time


                 El próximo jueves 21 de mayo a las 14 hs

                           Lucas Parra

                    City University of New York


During normal function neurons in the brain produce ionic currents  
that can be measured as electric field potentials. These signals  
provide an unique window into the temporal aspects of neuronal  
activity. They allow us to monitor, and indeed, modulate neuronal  
timing. Since we are interested in the human brain we use non-invasive  
electrodes and have to cope with low signal-to-noise ratios (SNR). The  
talk will present a framework for extracting single-trial information  
from functional imaging data with low SNR. When applied to  
surface-electrode signals (EEG) these tools are remarkably successful  
at extracting timing information, surpassing in fact the temporal  
accuracy of human behavioral response. We have given a dramatic  
demonstration of this by using these timing signals for a  
brain-computer interface in the context of broad-area image search.  
For this task we were able to show 400% improvement in human search  
performance.
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