DIPOLE MODELING IN FASTICA DECOMPOSITION OF EVOKED RESPONSES

Ricardo Nuno Vigário
Ricardo.Vigario@hut.fi

When applied to the decomposition of evoked responses, independent component analysis (ICA) is often used in a blind source separation framework, i.e., the goal is to identify underlying source signals from their instanta- neous linear mixtures, with no prior knowledge on the sources or the mixing process. Yet, often some mod- eling is explicitly or implicitly added when attempting to give a physiologically plausible interpretation to the result of the decomposition. Here we assume that all the relevant independent components can be modeled using equivalent current dipoles (ECDs). The incorporation of this modeling in- formation should simplify the search for the underlying brain activated sources, while giving better physiolog- ical grounds to ulterior interpretations of the decom- posed signals.