Table 2.
Geometric angles, estimated amplitude-distance constant, k, and distance, y′0 between contact 0 and the Vc/Vim border for 6 thalami in which the threshold amplitude increased monotonically with contact number. θ and Φ were calculated from the stereotactic ring and arc angles, respectively. Two thalami were excluded (gray) from calculation of parameter estimates due to the strong sensitivity of the parameter estimates when θ was less than 20°. In three thalami, the threshold amplitude did not increase monotonically with contact number, and the estimates of k and y′0 are listed as NA (not available) for these thalami.
| Subject | Side | θ | Φ | Estimated k (V/mm2) | Estimated y0' (mm) |
|---|---|---|---|---|---|
| 1 | L | 32 | 5 | NA | NA |
| 2 | L | 24 | 6.5 | 0.22 | 1.3 |
| 3 | L | 25 | 6 | 0.11 | 3.29 |
| 4 | L | 29 | 2 | NA | NA |
| 5 | L | 24.8 | −3.2 | 0.09 | 5.1 |
| 6 | R | 16.7 | 13.1 | 0.4 | 2.8 |
| 7 | L | 25 | 4 | 0.46 | 1.21 |
| 8 | L | 10 | 0 | 1.55 | 0.8 |
| 8 | R | 9.5 | 17.3 | NA | NA |