Biomedical Engineering Reference
In-Depth Information
Result
The EEPs could be recorded with the recording electrode when the electrical
stimulation was applied to any of the three stimulating positions, which are
shown in Figure 10.4. The implicit times of the first positive peak (P1) and the
amplitudes of the EEPs both are significantly different among the three different
Pulse duration
Stimulus
current
Amplitude
10
(a)
P1
5
0
0
10
20
30
40
50
60
ms
10
(b)
P1
5
0
0
10
20
30
40
50
60
ms
P1
10
(c)
5
0
0
10
20
30
40
50
60
ms
Figure 10.4. Diagram of stimulating current pulse (Top). EEPs recorded after biphasic
electrical pulse applied to different stimulating places of the optic nerve (Bottom): (a)
EEP elicited by stimulating the surface of the optical nerve sheath, (b) EEP elicited by
stimulation with the electrode intra- and para-optical nerve sheath, and (c) EEP elicited
by stimulation with the electrode intra-optical nerve. For the three stimulating places, the
pulses duration were 1 ms and the current amplitude was 50 A.
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