Table 1. Mean data from five motor evoked potentials obtained from left abductor pollicis brevis
| Anatomical site | Parameter | Anodal current | Cathodal current |
| Before | After | Before | After |
| Cortical | Latency (ms) | 27 ( 3) | 28 ( 3) | 26 ( 2) | 25 ( 2) |
| Amplitude (uV) | 360 (30) | 560 (40)* | 300 (50) | 440 (70)* |
| Threshold (mA) | 19.3 | 15.8* | 23.2 | 20.1* |
| Subcortical | Latency (ms) | 29 ( 2) | 28 ( 2) | 24 ( 2) | 23 ( 2) |
| Amplitude (uV) | 350 (80) | 490 (40) | 470 (60) | 590 (50) |
| Threshold (mA) | 20.2 | 15.4 | 21.6 | 19.4 |
The stimulation was delivered by a hand-held probe using anodal and cathodal current before and after tumor resection.
Standard deviation is shown within parenthesis.
Asterisk mark a statistical difference (p<0.05).