Table 4.

Analysis of t-t intervals

Pair	p-ISI	P50	P100	P150	pre#DLM	T50	T100	T150	p-t	pre p-t
1	n.s.	n.s.	n.s.	n.s.	n.s.	−0.49	−0.5	−0.44	0.31	0.18
2	−0.19	n.s.	n.s.	n.s.	n.s.	−0.24	n.s.	n.s.	0.25	0.19
3	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	0.13	n.s.
4	−0.11	n.s.	n.s.	n.s.	n.s.	−0.21	−0.16	−0.11	0.17	0.19
5	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	0.73	n.s.
6	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.	0.38	0.51

Values are correlation coefficients between t-t intervals and measures of the duration of the preceding ISI (p-ISI), the mean pallidal rate in the preceding 50 (P50), 100 (P100), and 150 (P150) ms, the number of thalamic spikes in the preceding pallidal ISI (pre#DLM), the mean thalamic rate in the preceding 50 (T50), 100 (T100), and 150 (T150) ms, the p-t interval measured in the same pallidal ISI (p-t), and the p-t interval measured in the preceding pallidal ISI (pre p-t). Correlations and P values were computed with the corrcoef function in MATLAB. P < 0.005 was considered significant.