Table 3.
Experiment 3: mean correlations of subject-specific FC spatial maps with (1) the task-related GLM map for the same subject (“Task-Related” column) and (2) the group IC of interest (“Group IC” column). Results of a paired t-test comparison of the mean correlations are shown in the rightmost columns. Higher correlations with the task-related maps than with the group IC of interest are an indication that the results reflect the individual-subject data without being overly biased by spatial features of the group IC. The group ICs were generated with PICA or Infomax. These results were based on group ICAs that produced 14 components.
| Method of Generating Maps | Group ICA Source | Mean Correlation With Subject-Specific Map (95% Confidence Interval) | Same = Seed Null Hypothesis Test | |||
|---|---|---|---|---|---|---|
| Task-Related | Group IC | t | df | P | ||
| Single-voxel seed | PICA | 0.84 (0.77–0.89) | 0.52 (0.48–0.55) | 7.7 | 13 | <.001 |
| 9-voxel ROI seed | PICA | 0.85 (0.79–0.89) | 0.53 (0.49–0.57) | 8.2 | 13 | <.001 |
| 40-voxel ROI seed | PICA | 0.86 (0.80–0.90) | 0.54 (0.49–0.58) | 8.9 | 13 | <.001 |
| Dual regression, 1 spatial map | PICA | 0.88 (0.84–0.91) | 0.55 (0.52–0.58) | 10.0 | 13 | <.001 |
| Dual regression, all spatial maps | PICA | 0.53 (0.47–0.59) | 0.59 (0.56–0.61) | −2.3 | 13 | .04 |
| Back-reconstruction | Infomax | 0.30 (0.22–0.38) | 0.62 (0.58–0.66) | −10.4 | 13 | <.001 |
| Dual regression, 1 spatial map | Infomax | 0.81 (0.73–0.87) | 0.43 (0.40–0.46) | 6.6 | 13 | <.001 |