[Todos] Coloquios del Departamento

[Pablo Dmitruk]

Les recordamos el coloquio de hoy,


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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


                  Hoy 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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