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