| by carcinoid tumors | 7 | other |
| sometimes | 3 | degree |
| in many brain disorders | 2 | other |
| serotonin → be → high | 11 |
| serotonin → be → increased | 9 |
| serotonin → be produced in → excess amounts | 5 |
| negative | neutral | positive |
| 0.390 | 0.386 | 0.223 |
| Raw frequency | 25 |
| Normalized frequency | 0.396 |
| Modifier score | 0.400 |
| Perplexity | 127.423 |