| Typicality: | 0.540 |
| Saliency: | 0.477 |
| to increase alertness | 11 | purpose |
| to change the way | 7 | purpose |
| directly | 5 | manner |
| drug → act on → central nervous system | 73 |
| drug → work on → central nervous system | 18 |
| drug → act as → central nervous system | 7 |
| drug → work in → central nervous system | 4 |
| drug → interact with → central nervous system | 3 |
| drug → act in → central nervous system | 3 |
| negative | neutral | positive |
| 0.368 | 0.554 | 0.078 |
| Raw frequency | 108 |
| Normalized frequency | 0.477 |
| Modifier score | 0.767 |
| Perplexity | 12.801 |