| in humans | 6 | other |
| sometimes | 3 | temporal |
| to name a few | 3 | other |
| toxin → cause → headache | 87 |
| toxin → lead to → headache | 9 |
| toxin → trigger → headache | 8 |
| toxin → result in → headache | 6 |
| toxin → be attributed to → headache | 4 |
| toxin → be linked to → headache | 3 |
| toxin → contribute to → headache | 3 |
| negative | neutral | positive |
| 0.907 | 0.079 | 0.014 |
| Raw frequency | 120 |
| Normalized frequency | 0.749 |
| Modifier score | 0.500 |
| Perplexity | 184.597 |