Table 2.
Participant’s sensation scores during experimental conditions.
| Anode electrode | Reference electrode | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| M1 | M1-DLPFC | M1-S1 | M1-V1 | Sham | M1 | M1-DLPFC | M1-S1 | M1-V1 | Sham | ||
| Tingling | Beginning | 3.6 ± 0.21 | 3.9 ± 0.34 | 4.3 ± 0.2 | 2.9 ± 0.27 | 2.1 ± 0.16 | 1.5 ± 0.13 | 1.8 ± 0.12 | 2.1 ± 0.13 | 1.7 ± 0.22 | 1.4 ± 0.19 |
| Middle | 2.1 ± 0.18 | 2.8 ± 0.15 | 1.4 ± 0.31 | 2.1 ± 0.14 | 1.4 ± 0.10 | 1.1 ± 0.18 | 0.7 ± 0. 10 | 1.4 ± 0.10 | 1.2 ± 0.16 | 1.0 ± 0.07 | |
| End | – | 1.1 ± 0.19 | 1.1 ± 0.45 | 1.7 ± 0.21 | 0.8 ± 0.10 | 0.5 ± 0.27 | 0.6 ± 0.11 | 0.8 ± 0.24 | 0.9 ± 0.19 | 0.5 ± 0.1 | |
| Itching | Beginning | 2.9 ± 0.09 | 3.0 ± 0.36 | 3.1 ± 0.64 | 1.3 ± 0.29 | 1.2 ± 0.21 | 1.1 ± 0.12 | 1.1 ± 0.09 | 1.2 ± 0.15 | 1.8 ± 0.11 | 1.1 ± 0.08 |
| Middle | 1.3 ± 0.28 | 1.9 ± 0.03 | 2.6 ± 0.12 | 0.9 ± 0.15 | 0.8 ± 0.14 | 0.4 ± 0.16 | 0.6 ± 0.25 | 0.6 ± 0.17 | 1.2 ± 0.15 | 0.8 ± 0.12 | |
| End | – | 0.7 ± 0.1 | 1.2 ± 0.52 | 0.7 ± 0.23 | – | 0.1 ± 0.20 | – | 0.3 ± 0.06 | 0.9 ± 0.12 | 0.6 ± 0.09 | |
| Burning | Beginning | – | – | 0.45 ± 0.1 | – | 0.23 ± 0.07 | – | – | – | – | |
| Middle | – | – | 0.31 ± 0.07 | – | 0.2 ± 0.03 | – | – | – | – | ||
| End | – | – | – | – | – | – | – | – | |||
| Not tolerated | Beginning | – | – | – | – | – | – | – | – | ||
| Middle | – | – | – | – | – | – | – | – | |||
| End | – | – | – | – | – | – | – | – | |||
The values are rated using the NAS. 0 is rated as no sensation and 10 rated as the worst sensation imaginable. The sensations are recorded during three phases of stimulation: Beginning (0–7 min of stimulation), Middle (7–14 min of stimulation), End (14–20 min of stimulation). Sensations under both active (anode) and reference (cathode) electrodes were recorded during a-tDCS of M1, S1, DLPFC and sham a-tDCS. Scores are reported.