Table 1.
Experiment | Active | Inactive | Intravenous reinforcer during acquisition | Target oral stimulus |
---|---|---|---|---|
1 | Nose poke | Nose poke | 30 µg/kg/infusion | 320 µM menthol |
2 | Lick | — | 3.5 µg/kg/infuion | 320 µM menthol |
3 | Lick | Lick | 7.5 µg/kg/infusion | 160 or 320 µM menthol |
0.1 or 1% licorice root extract | ||||
4 | Lick | Lick | 0 µg/kg/infusion | 1% licorice root extract |