Table 1.
Indices of HRV and EDA during baseline, PVT, n-back, and ship search (SS) tasks.
| Indices | BL | PVT | n-back | SS |
|---|---|---|---|---|
| SCL | 0.19 ± 3.9 | 3.5 ± 2.4 * | 4.6 ± 2.5 * | 5.6 ± 2.5 * |
| NS.SCRs | 2.1 ± 0.93 | 3.1 ± 1.1 | 2.1 ± 1.1 † | 2.5 ± 1.1 |
| EDASymp | 0.079 ± 0.1 | 0.12 ± 0.1 | 0.062 ± 0.064 | 0.19 ± 0.12 * ‡ |
| TVSymp | 0.29 ± 0.21 | 0.44 ± 0.2 | 0.28 ± 0.15 | 0.49 ± 0.25 * ‡ |
| HRVLF | 11 ± 3.6 | 10 ± 3.5 | 7.2 ± 3 * | 9 ± 2.1 |
| HRVLFn | 0.35 ± 0.093 | 0.4 ± 0.082 | 0.24 ± 0.085 * † | 0.38 ± 0.088 ‡ |
| HRVHF | 6.5 ± 1.5 | 6.5 ± 1.4 | 4.9 ± 1.6 * † | 4.9 ± 1.3 * † |
| HRVHFn | 0.21 ± 0.069 | 0.26 ± 0.08 | 0.16 ± 0.061 † | 0.2 ± 0.083 |
* significant differences to baseline, † significant differences to PVT, ‡ significant differences to n-back. SCL, skin conductance level; NS.SCRs, non-specific skin conductance responses; EDASymp, sympathetic component of the EDA; TVSymp, time-varying index of sympathetic tone; HRVLF, low-frequency components of heart rate variability (HRV); HRVLFn, normalized low-frequency components of HRV; HRVHF, high-frequency components of HRV; HRVHFn, normalized high-frequency components of HRV.