| very | 4 | degree |
| some times | 3 | temporal |
| brain → be → difficult | 16 |
| brain → be → tricky | 11 |
| brain → become → difficult | 4 |
| brain → include → difficulty | 3 |
| negative | neutral | positive |
| 0.594 | 0.341 | 0.066 |
| Raw frequency | 34 |
| Normalized frequency | 0.389 |
| Modifier score | 0.467 |
| Perplexity | 258.214 |