Table 8.
Experiment 5: mean percentages of thresholded task-related GLM maps that are covered by the thresholded subject-specific FC maps generated with each hybrid method below. The right-most column gives percentages after adjusting the z-score used to threshold the FC maps so that number of false positives equals number of false negatives. The results are similar to those from Experiment 3, with DRA covering less of the task-related maps than the SV, FV, MV, and DRS methods.
| Method of Generating Maps | Group ICA Source | Percent of Task-Related Map Covered (95% Confidence Interval) | |
|---|---|---|---|
| Before Threshold Adjustment | After Threshold Adjustment | ||
| Single-voxel seed (SV) | PICA | 54 (44–63) | 62 (52–71) |
| 9-voxel ROI seed (FV) | PICA | 58 (48–68) | 63 (53–72) |
| 40-voxel ROI seed (MV) | PICA | 62 (52–72) | 64 (54–74) |
| Dual regression, 1 spatial map (DRS) | PICA | 76 (68–85) | 69 (61–78) |
| Dual regression, all spatial maps (DRA) | PICA | 12 (7–16) | 43 (36–50) |