Table 1.
Group macrostructure laterality calculations for number of voxels and number of streamlines in the arcuate bundle. For both the STAN33 and HCP100 datasets, we tested for laterality for the three tractography methods DET, PROB, and ePROB using paired‐sample, one‐tailed t tests. The * indicates p‐values smaller than α = .05 (Bonferroni‐corrected). The three numbers for N indicate the number of subjects for whom only a left arcuate, both a left and a right arcuate, and only a right arcuate, respectively, could be identified
| STAN33 | HCP10 | ||||||
|---|---|---|---|---|---|---|---|
| DET | PROB | ePROB | DET | PROB | ePROB | ||
| N (left/both/right) | 0/33/0 | 0/33/0 | 0/33/0 | 0/100/0 | 0/100/0 | 0/100/0 | |
| Voxel count | Left mean | 510.2 | 2,623.6 | 1,211.1 | 1,508.1 | 7,037.1 | 4,788.4 |
| Left SD | 142.2 | 570.9 | 323.7 | 523.5 | 1,391.7 | 949.3 | |
| Right mean | 416.9 | 2,507.3 | 1,100.9 | 1,019.2 | 7,062.0 | 4,707.4 | |
| Right SD | 182.5 | 541.7 | 256.0 | 531.8 | 1,425.4 | 967.0 | |
| p‐Value | 2.49E‐03* | 6.62E‐02 | 8.41E‐03* | <10E‐06* | 5.94E‐01 | 1.49E‐01 | |
| t‐Value | 3.017 | 1.544 | 2.523 | 9.183 | ‐0.237 | 1.046 | |
| LI | 0.13 | 0.02 | 0.05 | 0.22 | 0.0 | 0.01 | |
| Streamline count | Left mean | 2,047.2 | 3,300.1 | 1,974.9 | 10,439.8 | 7,801.1 | 8,570.7 |
| Left SD | 1,049.6 | 890.9 | 724.6 | 4,463.3 | 1,557.9 | 2,082.8 | |
| Right mean | 1,022.7 | 3,075.5 | 1,408.9 | 5,563.4 | 5,779.3 | 6,755.3 | |
| Right SD | 908.2 | 928.6 | 503.3 | 4,704.0 | 1,572.5 | 1,814.6 | |
| p‐Value | 1.35E‐06* | 2.57E‐02 | <10E‐06* | <10E‐06* | <10E‐06* | <10E‐06* | |
| t‐Value | 5.723 | 2.025 | 5.597 | 9.542 | 14.095 | 10.180 | |
| LI | 0.44 | 0.04 | 0.16 | 0.38 | 0.16 | 0.12 | |
Abbreviations: LI = laterality index; SD = standard deviation.