Spatial mislocalization of EEG electrodes – effects on accuracy of dipole estimation

摘要: Abstract Objective : The estimation of cortical current activity from scalp-recorded potentials is a complicated mathematical problem that requires fairly precise knowledge the location scalp electrodes. It expected spatial mislocalization electrodes will introduce errors in this estimation. present study uses simulated and real data to quantify these for dipole sources spherical head model. Methods A 3 dimensional digitizer was used locate positions 31 placed on according 10–20 system 10 normal subjects. Dipole localizations were performed auditory evoked (AEPs) collected Results Computer simulations with several source configurations suggest locations orientations order 5 mm 5°, respectively, are possible electrode mislocalizations about 5°. In actual experimental settings, digitized typically mislocalized by an average 4° their standard These differences translated mean 8 5° orientations. Conclusions due within limits other modeling approximations noise.