Average infusions and active lever presses (which includes those presses during the 20 s timeout) across the last 2 d of self-administration (mean ± SEM)
| Experiment | Infusions | Active lever presses |
|---|---|---|
| Heroin dialysis | 26.3 ± 4.2 | 122.2 ± 40.9 |
| Heroin TTX dialysis | 16.7 ± 2.7 | 30.7 ± 4.1 |
| Yoked-heroin | 21.5 ± 4.0 | 7.7 ± 1.3 |
| Prelimbic infusions–dialysis | 47.8 ± 11.3 | 231.2 ± 82.8 |
| Cue–dialysis | 30.0 ± 5.6 | 83.7 ± 24.5 |
| CNQX | 48.9 ± 22.7 | 266.8 ± 194.0 |
| Fluphenazine | 21.0 ± 3.5 | 74.9 ± 29.8 |
| SCH | 28.6 ± 12.1 | 126.5 ± 83.5 |
| Sulpiride | 20.1 ± 3.2 | 55.4 ± 33.0 |
| Cue–fluphenazine + CNQX | 35.5 ± 6.8 | 102.8 ± 39.0 |