Table I.
Subject characteristics and means and standard deviations for arcuate fasciculus (AF) measurements
| All subjects (n = 36) | Females (n = 12) | Males (n = 24) | |
|---|---|---|---|
| Age (mean ± SD) | 31.3 ± 9.7 | 34.4 ± 10.7 | 29.7 ± 10.7 |
| Handedness (right/left)a | 34/2 | 12/0 | 22/2 |
| Years of educationb | 15.0 ± 2.6 | 14.8 ± 2.4 | 15.0 ± 2.8 |
| Total brain volume (cc) | 1415.5 ± 155.8 | 1265.7 ± 80.7 | 1487.4 ± 129.8 |
| White matter volume (cc) | 540.4 ± 76.6 | 484.7 ± 44.0 | 567.1 ± 75.0 |
| Gray matter volume (cc) | 703.8 ± 78.8 | 619.2 ± 44.8 | 744.5 ± 55.6 |
| Verbal fluency total scorea | 11.38 ± 3.14 | 10.45 ± 3.24 | 11.83 ± 3.07 |
| Hemisphere | Left | Right | Left | Right | Left | Right |
|---|---|---|---|---|---|---|
| Arcuate FA | 0.470 ± 0.029 | 0.470 ± 0.038 | 0.470 ± 0.037 | 0.474 ± 0.052 | 0.470 ± 0.026 | 0.469 ± 0.043 |
| Arcuate tract volume (cc) | 4.48 ± 2.82 | 4.03 ± 2.86 | 3.39 ± 2.80 | 2.84 ± 2.36 | 5.01 ± 2.74 | 4.63 ± 2.94 |
| Arcuate axial diff (×104 mm2/s) | 10.79 ± 0.35 | 10.27 ± 0.41 | 10.78 ± 0.40 | 10.32 ± 0.37 | 10.79 ± 0.33 | 10.24 ± 0.44 |
| Arcuate radial diff (×104 mm2/s) | 5.46 ± 0.20 | 5.21 ± 0.42 | 5.48 ± 0.19 | 5.22 ± 0.18 | 5.45 ± 0.21 | 5.21 ± 0.50 |
| Overall cortical thickness (mm) | 4.61 ± 0.14 | 4.58 ± 0.15 | 4.62 ± 0.14 | 4.62 ± 0.15 | 4.55 ± 0.13 | 4.64 ± 0.15 |
| Middle temporal gyrus (mm) | 5.18 ± 0.61 | 5.17 ± 0.38 | 5.18 ± 0.28 | 5.19 ± 0.74 | 5.10 ± 0.43 | 5.22 ± 0.35 |
| Superior temporal gyrus (mm) | 5.37 ± 0.53 | 5.35 ± 0.27 | 5.39 ± 0.27 | 5.43 ± 0.59 | 5.33 ± 0.31 | 5.48 ± 0.30 |
| Supramarginal gyrus (mm) | 4.85 ± 0.84 | 4.90 ± 0.56 | 4.84 ± 0.36 | 4.78 ± 0.84 | 4.75 ± 0.47 | 4.79 ± 0.42 |
| Precentral gyrus (mm) | 4.53 ± 0.39 | 4.50 ± 0.22 | 4.53 ± 0.20 | 4.50 ± 0.48 | 4.42 ± 0.23 | 4.52 ± 0.26 |
| Postcentral gyrus (mm) | 4.62 ± 0.69 | 4.59 ± 0.40 | 4.64 ± 0.33 | 4.47 ± 0.72 | 4.41 ± 0.39 | 4.50 ± 0.37 |
| Inferior frontal gyrus (mm) | 4.42 ± 0.17 | 4.45 ± 0.18 | 4.40 ± 0.17 | 4.59 ± 0.17 | 4.58 ± 0.17 | 4.59 ± 0.17 |
| Superior occipital gyrus (mm)c | 3.97 ± 0.27 | 3.97 ± 0.27 | 3.97 ± 0.27 | 3.86 ± 0.24 | 3.88 ± 0.25 | 3.85 ± 0.25 |
a
Verbal fluency scores averaged across letters (range, 5–19), which are similar to reported norms, for example, [Loonstra et al., 2001], were unavailable for one male and one female subject. Means represent raw values (uncorrected for sex or age).
b
Education data were unavailable for one male subject.
c
Control region: the superior occipital gyrus is a region of interest through which the AF does not pass.