Table 3.

Individual subjects’ registration accuracy using the Principal Axis and Nearest Neighbor Approximation techniques. Electrode displacement is additionally reported as length of the vector between pre- and post-registration of electrodes as an estimate of average brain shift.

Pt.	Principal Axis - Manual (mm) Mean (min-max)	Nearest Neighbor - Manual (mm) Mean (min-max)	Principal Axis vs. Nearest Neighbor Statistics	Electrode displacement (mm) Mean (min-max)
1	0.0 (0.0 – 0.0)	1.1 (0.0 – 10.7)	t(115) = 8.1 p < .0001)	3.9 (0.2 – 14.7)
2	0.2 (0.0 – 3.8)	1.6 (0.0 – 5.4)	t(60) = 8.4 p < .0001)	5.0 (0.3 – 12.4)
3	0.6 (0.0 – 13.2)	4.0 (0.0 – 15.5)	t(55) = 5.9 p < .0001)	8.0 (0.0 – 14.3)
4	0.1 (0.0 – 2.5)	1.1 (0.0 – 5.6)	t(85) = 10.7 p < .0001)	4.6 (0.1 – 10.8)
5	0.0 (0.0 – 0.0)	0.9 (0.0 – 11.9)	t(114) = 7.3 p < .0001)	3.4 (0.2 – 12.7)
6	0.0 (0.0 – 0.0)	1.0 (0.0 – 3.2)	t(43) = 8.5 p < .0001)	3.8 (0.2 – 7.8)
7	0.2 (0.0 – 5.9)	1.7 (0.0 – 7.4)	t(121) = 8.3 p < .0001)	6.0 (0.2 – 14.2)
8	0.0 (0.0 – 0.0)	1.6 (0.0 – 6.2)	t(91) = 12.7 p < .0001)	5.1 (0.1 – 10.5)
9	0.6 (0.0 – 10.2)	1.3 (0.0 – 3.5)	t(91) = 3.2 p < .0001)	6.3 (1.0 – 11.6)
10	2.6 (0.0 – 25.9)	2.1 (0.0 – 6.1)	t(62) = 1.0 p = .309)	6.1 (1.4 – 13.0)