| with another chemical | 5 | other |
| in controlling his pain | 4 | transitive-object |
| with glutamate | 3 | other |
| ketamine → have → role | 6 |
| ketamine → work via → interaction | 3 |
| negative | neutral | positive |
| 0.078 | 0.764 | 0.157 |
| Raw frequency | 9 |
| Normalized frequency | 0.318 |
| Modifier score | 0.500 |
| Perplexity | 39.087 |