Table 1.
Details of epidural volleys recorded in each of the six patients studied
| Type and latency of volleys (ms) evoked at supra-threshold intensities | ||||||||
|---|---|---|---|---|---|---|---|---|
| Patient | Type of stimulation | Active motor threshold (%) | Lowest threshold volley (s) | L1 | L2 | L3 | L4 | L5 |
| 1 | Lateral anodal | 30 | L1; L2; L3 | 6.2 | 7.3 | 8.7 | — | — |
| Vertex anodal | 25 | L2; L3 | — | 7.3 | 8.7 | — | — | |
| Magnetic PA | 44 | L2 | 6.2 | 7.3 | 8.7 | 10.2 | 11.8 | |
| Magnetic ML | 50 | L2 | 6.2 | 7.3 | 8.7 | 10.2 | 11.8 | |
| 2 | Lateral anodal | 24 | L1 | 5.7 | — | — | — | — |
| Vertex anodal | 25 | L2 | 5.7 | 7.0 | 8.7 | — | — | |
| Magnetic PA | 65 | L2 | 5.7 | 7.0 | 8.7 | 10.3 | 11.8 | |
| Magnetic ML | 45 | L2 | 5.7 | 7.0 | 8.7 | 10.3 | 11.8 | |
| 3 | Lateral anodal | 38 | L1; L2 | 6.2 | 7.8 | — | — | — |
| Vertex anodal | 50 | L1 | 6.2 | — | — | — | — | |
| Magnetic PA | 55 | L2 | 6.2 | 7.8 | 9.4 | 11.2 | — | |
| Magnetic ML | 70 | L2 | 6.2 | 7.8 | 9.4 | — | — | |
| 4 | Lateral anodal | 43 | L1 | 6.0 | — | — | — | — |
| Vertex anodal | 37 | L2 | — | 7.3 | — | — | — | |
| Magnetic PA | 41 | L2 | — | 7.3 | 9.0 | 10.4 | 12.1 | |
| 5 | Lateral anodal | 35 | L1 | 4.3 | — | — | — | — |
| Vertex anodal | 40 | L1 | 4.3 | — | — | — | — | |
| Magnetic PA | 61 | L2 | — | 5.8 | — | — | — | |
| 6 | Lateral anodal | 32 | L1 | 3.6 | — | — | — | — |
| Vertex anodal | 35 | L2 | — | 5.0 | — | — | — | |
| Magnetic PA | 38 | L2 | — | 5.0 | 6.7 | 8.2 | — | |
PA postero-anterior direction, ML medio-lateral direction.