Table 1.
Group (n) | Reinforcement rates
|
Lever press rates/session, last 5 sessions
|
||
---|---|---|---|---|
Total infusions | Infusions/session, last 5 sessions | Active lever | Inactive Lever | |
Cocaine
|
||||
IC/Short (10) | 479.5 ± 37.7 | 36.8 ± 1.8 | 211.3 ± 15.2 | 2.7 ± 1.6 |
EE/Short (9) | 494.0 ± 37.1 | 40.7 ± 2.8 | 221.6 ± 19.8 | 5.5 ± 2.4 |
IC/Long (10) | 489.4 ± 34.8 | 40.3 ± 2.2 | 218.0 ± 17.1 | 4.6 ± 3.8 |
EE/Long (10) | 481.2 ± 40.3 | 37.8 ± 2.4 | 214.8 ± 15.7 | 6.5 ± 5.8 |
Saline-Yoked
|
||||
IC/Short (10) | N.A. | N.A. | 4.9 ± 1.8 | 6.2 ± 2.3 |
EE/Short (10) | N.A. | N.A. | 3.6 ± 2.1 | 4.1 ± 1.9 |
IC/Long (10) | N.A. | N.A. | 1.6 ± 0.9 | 5.6 ± 2.3 |
EE/Long (10) | N.A. | N.A. | 2.4 ± 1.4 | 4.8 ± 1.7 |
Note. Group abbreviations refer to Isolated Condition (IC) or Environmental Enrichment (EE) for either a Short (i.e., 1 day) or Long (i.e., 21 days) period of forced abstinence.