| chemical → be found in → the brain | 15 |
| chemical → be present in → the brain | 5 |
| chemical → be linked to → brain | 4 |
| chemical → be in → the brain | 3 |
| negative | neutral | positive |
| 0.265 | 0.549 | 0.187 |
| Raw frequency | 27 |
| Normalized frequency | 0.365 |
| Modifier score | 0.950 |
| Perplexity | 87.737 |