Effects of cavity on EEG inverse dipole solution

Effects of a cavity in the head on the EEG inverse dipole solution have been investigated by computer simulation. The human head is represented by a sphere conductor with an eccentric sphere cavity in it, and two different electrode configurations with 21 electrodes have been examined: one is similar to the international 10-20 system, and the other is a uniform arrangement over the whole scalp. The potentials generated by a trial dipole in the eccentric sphere model were used for estimating the dipole based on a spherical model without cavity with the least -squared-error fit procedure. The simulation results show that the effects of the cavity on the EEG inverse dipole solution strongly depend on the location and orientation of the dipole as well as the electrode configuration.<>