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| Group | Saline responses | Antagonist responses |
|---|---|---|
| SCH 39166 | 486.42 (±73.14) | 91 (±36.92)** |
| Eticlopride | 402.5 (±74.62) | 72.83 (±26.09)** |
| Naltrexone | 495.17 (±51.32) | 305.58 (±33.07)** |
SCH 39166, eticlopride, and naltrexone all significantly reduced responding for water on an RR2 schedule of reinforcement compared with saline (**p<0.01). The values are the means±SEM. SCH 39166, n=12; eticlopride, n=6; naltrexone, n=12.
