Figure 8.
Residual error of visual evoked source estimates. (A) Normalized residual error for underconstrained but regularized (assumed SNR = 1 RMS) source models including (1) retinotopy‐constrained dipole locations and orientations, (2) retinotopy‐constrained dipole locations with free orientations, and (3) L 2 minimum norm (dSPM). All three models allow independence between stimulus locations. (B) Normalized residual error for retinotopy‐constrained source estimates with (1) smoothness constraint, and (2) equality constraint. Normalized residual error was calculated as the ratio between the variance of the residual error and the total variance of the data. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]