Table 1.

Number of tissue samples near identified electrode tips that received each score given by the histopathologist, who had been blinded to the stimulation condition. The only group whose score distribution was significantly different from the control condition was the 20 μA, 1/3 duty cycle, 5 s condition (p = 0.03, Fisher–Freeman–Halton exact test).

	Amp. (μA)		10	20	20	20	20	100	100
	Duty cycle	Control	1/1	1/3	1/3	1/1	1/1	1/3	1/1
	Duration (s)		5	1	5	1	5	1	1
	No damage	25	3	11	6	1	6	3	4
Scarring	Minimal	11	1	4	8	0	1	1	0
	Mild	0	0	0	0	0	0	0	0
	No damage	15	0	6	4	1	5	1	4
Gliosis	Minimal	18	3	9	4	0	2	3	0
	Mild	3	1	0	6	0	0	0	0