動径成分の信頼限界に基づいた脳波信号源推定の精度評価

抄録

This study describes a simplified confidence limit only for the radial distance of estimated multiple equivalentcurrent dipoles (ECDs), by which the localization accuracy is quantitatively evaluated. By applying multiple ECD localization to three kinds of actual visual event-related potentials (ERPs), this measure was compared with normalized root mean square (nRMS), and its dependence on dipole position and moment was investigated. The present results show that the confidence limit depends on the radial distance of the dipoles, that the confidence limit is a localization accuracy measure conceptually different from the nRMS and that larger dipole moment yields misleadingly higher accuracy, independently of the number of ECDs.