Table 4.
Correlations between differences in brain activation, hydration parameters and performance and difficulty ratings in the scanner.
| Perceived difficulty | Happy | Energetic | Anxious | Depressed (outside of the scanner) | Energetic (outside of the scanner) | Composed (outside of the scanner) | |
|---|---|---|---|---|---|---|---|
| ∆ RR interval | −0.456* | 0.086 | 0.145 | −0.613* | 0.336 | −0.179 | 0.475* |
| ∆ SD of R-R interval | −0.540* | −0.068 | −0.133 | −0.746* | 0.650* | −0.041 | 0.445* |
| ∆ RMSSD | −0.298 | 0.058 | −0.195 | −0.259 | 0.382 | 0.433 | −0.129 |
| mOFC | −0.601* | 0.278 | 0.247 | −0.722* | 0.393 | −0.101 | 0.158 |
| vCG | −0.754* | −0.228 | −0.296 | −0.774* | 0.752* | −0.032 | 0.114 |
| PoCG | −0.026 | −0.036 | −0.034 | −0.319 | 0.007 | 0.471 | 0.103 |
*p < 0.05 RR, interbeat interval, SDNN, standard deviation of normal to normal R-R interval, RMSSD, root mean square of the standard deviation, mOFC, medial orbitofrontal cortex, PoCG, post-central gyrus, vCG, ventral cingulate gyrus.