Table 2.
Reinforcers obtained (±SEM) during self-administration sessions 1 and 20 and the first extinction session (Ext 1) by female rats (n in parentheses) at different phases of the estrous cycle in Experiment 4.*
| Cycle phase | Self-administration session | ||
|---|---|---|---|
| 1 | 20 | EXT1 | |
| Estrus | 7.5 ± 1.3 (22) | 7.1 ± 1.3 (33) | 6.4 ± 1.6 (23) |
| Diestrus/metestrus | 7.4 ± 1.3 (33) | 7.1 ± 1.4 (24) | 6.9 ± 1.0 (26) |
| Proestrus | 4.8 ± 1.7 (6) | 6.0 ± 4.0 (4) | 5.6 ± 1.6 (12) |
*
There were no significant effects of estrous cycle phase on reinforcers obtained.