ESTIMATING AND TESTING THE SOURCES OF EVOKED-POTENTIALS IN THE BRAIN

The source of an event related brain potential (ERP) is estimated from multivariate measurements of this ERP on the head under several mathe matical and physical constraints on the parameters of the source model . We will discuss statistical aspects of standard methods to estimate these parameters and their confidence intervals. In addition new princ ipled tests of the goodness of fit as well as of differences between e stimated sources are proposed and compared with customary approaches i n psychophysiology. Several factors which influence the statistical an alysis, in particular the number of measurement leads, will be discuss ed.