Effects of Electrode Position on Spatiotemporal Auditory Nerve Fiber Responses: A 3D Computational Model Study

Table 2

Summary of the effects of electrode position on electrically evoked responses.

Stimulus		Electrode position				Figure
		A	B	C	D
Single pulse	RS	0.041	0.040	0.028	0.031	Figure 3
	Threshold (mA)^*	2.66	0.48	0.29	1.51	Figure 3
	Jitter (ms)	0.019	0.017	0.024	0.022	Figure 3
	Mean latency (ms)	0.65	0.65	0.58	0.65	Figure 3
	Initiated nodes	P1, 2	P1, 2	P3, C2	P3	Figure 5
Pulse-train; (250 pulse/s)	Dynamic range (dB)	0.81	1.03	0.73	0.59	Figure 6
	Threshold (mA)	2.64	0.47	0.28	1.49	Figure 6
	Initiated nodes	P1, 2, 3	P1, 2	C1, 2	P1, 2, 3	Figure 7
	ISI mean (0–12 ms); (100–200 ms); ISI std. dev. (0–12 ms); (100–200 ms)	5.32; 8.06; 2.40; 4.37	5.10; 7.25; 2.13; 4.39	5.36; 7.10; 2.50; 4.08	5.19; 7.99; 2.27; 5.04	Figure 8
Pulse-train; (5000 pulse/s)	Dynamic range (dB)	0.32	0.36	0.39	0.19	Figure 6
	Threshold (mA)^**	2.60	0.43	0.23	1.31	Figure 6
	Initiated nodes	P1, 2, 3; C1, 2, 3	P1, 2, 3	P2, 3, 4,; C1, 2, 3	P1, 2, 3, 4; C2, 4	Figure 7
	ISI mean (0–12 ms)^***; (100–200 ms); ISI std. dev. (0–12 ms); (100–200 ms)	4.98; 8.98; 2.93; 6.35	4.59; 8.61; 2.87; 5.53	5.10; 7.78; 2.38; 4.91	4.63; 8.04; 1.83; 4.80	Figure 8

^*Current level evoked 0.5-firing efficiency; ^**current level evoked a 100-spike/s onset response; ^***interspike interval at onset response of 250 spikes/s.
C: central, ISI: interspike interval, P: peripheral, RS: relative spread, and std. dev.: standard deviation.