Table 2. Correlations (Spearman correlation coefficients) between each behavioural measure and brain serotonin 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 = − 0.6299* P < 0.0001 |
r = − 0.5040* P < 0.0001 |
r = − 0.6299* P < 0.0001 |
r = − 0.6299* P < 0.0001 |
r = − 0.7559* P < 0.0001 |
| Average interaction time |
r = − 0.6547* P < 0.0001 |
r = − 0.5144* P < 0.0001 |
r = − 0.5923* P < 0.0001 |
r = − 0.5923* P < 0.0001 |
r = − 0.7638* P < 0.0001 |
| Cleaning bites |
r = − 0.5774* P < 0.0001 |
r = − 0.4124* P < 0.0001 |
r = − 0.2474* P < 0.0001 |
r = − 0.2474* P < 0.0001 |
r = − 0.5774* P < 0.0001 |
| Proportion of interactions with tactile stimulation |
r = − 0.6547* P < 0.0001 |
r = − 0.5144* P < 0.0001 |
r = − 0.5923* P < 0.0001 |
r = − 0.5923* P < 0.0001 |
r = − 0.7638* P < 0.0001 |
| Proportion of time spent providing tactile stimulation |
r = − 0.6547* P < 0.0001 |
r = − 0.5144* P < 0.0001 |
r = − 0.5923* P < 0.0001 |
r = − 0.5923* P < 0.0001 |
r = − 0.7638* P < 0.0001 |
| Incidence of chases |
r = 0.1559 P = 0.75 |
r = 0.7326 P = 0.0714 |
r = 0.5455 P = 0.1786 |
r = 0.4364 P = 0.3214 |
r = 0.4053 P = 0.3571 |
| Client N = 10 | |||||
| Number of interactions |
r = − 0.2317 P = 0.5060 |
r = − 0.7012* P = 0.0261 |
r = 0.2622 P = 0.4618 |
r = − 0.01220 P = 0.9665 |
r = − 0.3537 P = 0.3056 |
| Average interaction time |
r = − 0.2364 P = 0.5135 |
r = 0.2485 P = 0.4918 |
r = − 0.6606* P = 0.0438 |
r = − 0.3455 P = 0.3304 |
r = − 0.7212* P = 0.0234 |
| Cleaning bites |
r = − 0.2614 P = 0.4527 |
r = − 0.4499 P = 0.1864 |
r = − 0.1581 P = 0.6491 |
r = − 0.1945 P = 0.6491 |
r = − 0.6201 P = 0.0576 |
| Proportion of interactions with tactile stimulation |
r = 0.05839 P = 0.8775 |
r = − 0.1752 P = 0.4882 |
r = 0.4671 P = 0.1747 |
r = 0.5579 P = 0.0984 |
r = 0.6487* P = 0.0492 |
| Proportion of time spent providing tactile stimulation |
r = − 0.3576 P = 0.3129 |
r = 0.1758 P = 0.6321 |
r = − 0.1758 P = 0.6321 |
r = − 0.3212 P = 0.3679 |
r = − 0.1152 P = 0.7589 |
| Frequency client jolts/100 s |
r = 0.1702 P = 0.6371 |
r = 0.5775 P = 0.0851 |
r = − 0.7112* P = 0.0240 |
r = 0.03040 P = 0.9382 |
r = − 0.07295 P = 0.8298 |