Table 3.
Average and maximum source localization errors for different sources of forward modeling errors in different brain regions
| Cortical areas | Head model | Conductivity ratio (assumed) | Co-registration | # of sensors | Coverage | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| SPH | Warped MNI 4-layer | 5-Layer model (with w.m.) | 80:1 | 15:1 | 5° Back | 5° Left | 16 (balanced) | 16 (imbalanced) | ||
| Right | Left | |||||||||
| Upper Frontal | ||||||||||
| Mean | 7.7 | 5.1 | 2.2 | 10.6 | 4.4 | 6.6 | 4.9 | 7.1 | 8.5 | 15.9 |
| Max | 20.9 | 14.0 | 13.4 | 19.1 | 7.4 | 12.0 | 8.3 | 20.4 | 16.4 | 37.8 |
| Lower frontal | ||||||||||
| Mean | 10.2 | 8.0 | 3.1 | 12.1 | 5.1 | 6.3 | 3.7 | 8.8 | 10.8 | 15.8 |
| Max | 24.2 | 15.0 | 13.5 | 28.5 | 9.4 | 12.2 | 7.4 | 17.6 | 21.7 | 50.4 |
| Temporal | ||||||||||
| Mean | 12.3 | 9.4 | 4.1 | 12.8 | 5.6 | 2.8 | 5.0 | 11.7 | 7.4 | 12.8 |
| Max | 27.9 | 20.0 | 16.2 | 29.9 | 12.5 | 7.1 | 9.4 | 23.1 | 23.7 | 62.4 |
| Parietal | ||||||||||
| Mean | 10.3 | 10.1 | 3.6 | 12.9 | 5.4 | 6.2 | 2.6 | 13.2 | 11.6 | 18.0 |
| Max | 20.3 | 15.0 | 11.7 | 19.4 | 8.0 | 9.1 | 8.3 | 26.6 | 18.2 | 33.8 |
| Occipital | ||||||||||
| Mean | 10.6 | 6.1 | 2.5 | 11.4 | 4.5 | 5.2 | 4.4 | 8.6 | 11.1 | 24.2 |
| Max | 18.7 | 16.9 | 15.0 | 21.7 | 8.2 | 11.7 | 6.4 | 32.0 | 17.8 | 23.7 |
| Sub-cort. cerebellum | ||||||||||
| Mean | 10.2 | 11.2 | 4.2 | 13.5 | 5.1 | 3.9 | 3.3 | 12.2 | 14.4 | 20.5 |
| Max | 27.0 | 27.0 | 18.6 | 31.8 | 13.0 | 8.9 | 7.1 | 29.3 | 36.1 | 54.9 |
| Total | ||||||||||
| Mean | 10.2 | 8.4 | 3.4 | 12.2 | 5.0 | 4.9 | 4.1 | 10.3 | 10.8 | 18.2 |
| Max | 27.9 | 27.0 | 18.6 | 31.8 | 13.0 | 12.2 | 9.4 | 32.0 | 36.1 | 62.4 |