Table 2.
Spherical deconvolution and tractography parameters
| Group | α | No. iterations | Angle (°) | Absolute | Relative (%) | Length (mm) |
|---|---|---|---|---|---|---|
| Human | 0.25 | 1000 | 30 | 0.40 | 4 | 20–400 |
| Vervet 1 | 0.50 | 1000 | 45 | 0.20 | 5 | 10–400 |
| Vervets 2–4 | 0.10 | 2000 | 45 | 0.20 | 5 | 10–400 |
| RM | 0.10 | 3000 | 45 | 0.20 | 5 | 10–400 |
| CM 2104 | 0.15 | 2000 | 35 | 0.15 | 5 | 10–400 |
| CM 2203 | 0.38 | 2000 | 40 | 0.18 | 5 | 10–400 |
| RM in vivo | 1.00 | 1500 | 35 | 0.15 | 5 | 10–400 |
Unless indicated, the monkey datasets were acquired ex vivo. The above parameters are explained fully by Dell'Acqua et al. (2013). α, Shape factor of the fiber response function; No. iterations of the spherical deconvolution algorithm; Angle, maximum angle threshold between adjacent voxels; Absolute, a tractography stopping threshold based on the absolute value of the hindrance-modulated orientational anisotropy index; Relative, a stopping threshold for tractography set to a percentage of the maximum lobe amplitude of the fiber orientation distribution function; Length, is the length threshold for streamlines. CM, cynomolgus macaque; RM, rhesus macaque.