Table 3. Correlations (Spearman correlation coefficients) between each behavioural measure and brain dopamine levels in different brain macro-areas: forebrain, diencephalon, optic tectum, cerebellum, and brain stem; for two experimental treatments: conspecific introduced to cleaner and client introduced to cleaner.
Significant correlations are highlighted in bold and marked with * for p < 0.05, that correlation was true for the false discovery rate test.
| Behaviour | Brain macro-areas | ||||
|---|---|---|---|---|---|
| Forebrain | Diencephalon | Optic tectum | Cerebellum | Brain stem | |
| Conspecific N = 8 | |||||
| Number of interactions |
r = 0.1260 P = 0.6429 |
r = 0.5040 P = 0.2857 |
r = 0.5040 P = 0.2857 |
r = − 0.1260 P = 0.2857 |
r = 0.3780 P = 0.4286 |
| Average interaction time |
r = 0.09352 P = 0.6786 |
r = 0.4520 P = 0.2857 |
r = 0.4520 P = 0.2857 |
r = − 0.1559 P = 0.3214 |
r = 0.3429 P = 0.3929 |
| Cleaning bites |
r = − 0.08248* P < 0.0001 |
r = 0.08248 P = 0.2500 |
r = 0.08248 P = 0.2500 |
r = − 0.2474* P < 0.0001 |
r = 0.08248 P = 0.2500 |
| Proportion of interactions with tactile stimulation |
r = 0.09352 P = 0.6786 |
r = 0.4520 P = 0.2857 |
r = 0.4520 P = 0.2857 |
r = − 0.1559 P = 0.3214 |
r = 0.3429 P = 0.3929 |
| Proportion of time spent providing tactile stimulation |
r = 0.09352 P = 0.6786 |
r = 0.4520 P = 0.2857 |
r = 0.4520 P = 0.2857 |
r = − 0.1559 P = 0.3214 |
r = 0.3429 P = 0.3929 |
| Incidence of chases |
r = 0.07793 P = 0.6429 |
r = − 0.5455* P < 0.0001 |
r = 0.04676 P = 0.5714 |
r = 0.2962 P = 0.5 |
r = − 0.265 P = 0.1786 |
| Client N = 10 | |||||
| Number of interactions |
r = 0.1463 P = 0.6864 |
r = 0.1524 P = 0.6743 |
r = 0.2744 P = 0.4403 |
r = − 0.1037 P = 0.7637 |
r = − 0.1341 P = 0.6997 |
| Average interaction time |
r = − 0.2970 P = 0.4069 |
r = 0.006061 P > 0.9999 |
r = − 0.06667 P = 0.8651 |
r = − 0.01818 P = 0.9730 |
r = 0.5394 P = 0.1139 |
| Cleaning bites |
r = 0.1033 P = 0.7773 |
r = 0.2736 P = 0.4412 |
r = 0.2918 P = 0.4112 |
r = − 0.2553 P = 0.4622 |
r = 0.09119 P = 0.8037 |
| Proportion of interactions with tactile stimulation |
r = 0.08434 P = 0.8177 |
r = − 0.03892 P = 0.7624 |
r = 0.2076 P = 0.5610 |
r = − 0.2141 P = 0.4202 |
r = − 0.5644 P = 0.0542 |
| Proportion of time spent providing tactile stimulation |
r = − 0.2727 P = 0.4483 |
r = − 0.3333 P = 0.3487 |
r = − 0.2606 P = 0.4697 |
r = − 0.3333 P = 0.3487 |
r = 0.1273 P = 0.733 |
| Frequency client jolts/100 s |
r = − 0.07903 P = 0.8177 |
r = − 0.06687 P = 0.8447 |
r = − 0.01216 P = 0.9655 |
r = − 0.1337 P = 0.699 |
r = 0.3647 P = 0.2985 |