| very | 9 | degree |
| for brain power | 8 | purpose |
| for light adaptation | 7 | purpose |
| dopamine → be → important | 32 |
| dopamine → be → essential | 29 |
| dopamine → be → critical | 17 |
| dopamine → be → crucial | 11 |
| dopamine → be → necessary | 6 |
| dopamine → be → vital | 6 |
| negative | neutral | positive |
| 0.081 | 0.576 | 0.343 |
| Raw frequency | 101 |
| Normalized frequency | 0.695 |
| Modifier score | 0.500 |
| Perplexity | 70.149 |