Sensitivity Analysis of the Forward Electroencephalographic Problem Depending on Head Shape Variations

Figure 4

Simulated EEG recording (mV s) originating from a spherical homogeneous conductor containing a small cavity (left column) as described in Section 4.1 in the case of neuronal excitation beneath the injury. Each row represents a specific dipole arrangement, namely, (1) positioned at m and , with moments  Cm; (2) at m, , , and  Cm; (3) situated at m, , , and  Cm. The corresponding recording concerning the unperturbed instance is shown in the middle column for the analogous dipole locations and moments, whereas (c), (f), and (i) specify the contribution of the first-order correction on as expressed by (32) for . On the other hand, Figures (j) and (k) provide a closer visual examination regarding the effect of the perturbation in the neighborhood of the excitation.