Table 2.

Number of patients for whom the variance ratio S of measure profiles involving focal, neighboring, contralateral, or extra-focal contacts was significantly smaller (first row) or larger (second row) than for profiles from the other contact combinations.

	Focal contacts (f/f, f/n, f/c, f/e)	Neighboring contacts (n/n, f/n, n/c, n/e)	Contralateral contacts (c/c, f/c, n/c, c/e)	Extra-focal contacts (e/e, f/e, n/e, c/e)
# Patients with sign. smaller S	6/18	7/18	5/12	6/18
# Patients with sign. larger S	4/18	4/18	4/12	6/18

Bilateral electrode implantations with contacts contralateral to the epileptic focus were performed in 12 of 18 patients.