Table 2. Response rate (responses/min) and Pellets earned per session in the final 5 sessions of both the Fixed Ratio 10 TO 20 s and Progressive Ratio experiments.
| Schedule | Treatment group | Response Rate | Pellets Earned Per Session |
| Fixed Ratio | Adolescent CIE-exposed | 69.20±15.39 | 23.00±4.80 |
| Adolescent Saline-exposed | 53.49±9.66 | 23.99±8.31 | |
| Adult CIE-exposed | 60.77±19.03 | 16.43±2.71 | |
| Adult Saline-exposed | 47.58±10.11 | 16.77±4.21 | |
| Progressive Ratio | Adolescent CIE-exposed | 110.67±16.64 | 13.53±0.90 |
| Adolescent Saline-exposed | 106.13±11.40 | 13.33±1.05 | |
| Adult CIE-exposed | 110.56±8.90 | 12.44±0.61 | |
| Adult Saline-exposed | 103.32±9.00 | 12.40±0.85 |
Data are expressed as group mean ±SEM. There were no significant differences attributable to either Age at treatment (adolescent vs. adult) or Treatment (CIE or saline).