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Female mice self-administered more heroin than male mice in the LgA (6 h) sessions.
| Sex | Session 1 | Session 2 | Session 3 | Session 4 | Session 5 | Session 6 | Session 7 | Session 8 | Session 9 | Session 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Male | 52 ± 6 | 53 ± 6 | 44 ± 4 | 52 ± 5 | 57 ± 6 | 56 ± 8 | 62 ± 8 | 54 ± 10 | 60 ± 10 | 55 ± 8 |
| Female | 90 ± 7&& | 91 ± 9&& | 102 ± 11&& | 95 ± 12&& | 92 ± 10&& | 89 ± 11&& | 95 ± 14&& | 95 ± 13&& | 90 ± 11&& | 93 ± 10&& |
The data are expressed as mean ± SEM. n = 8–11.
p < 0.01, different from males (overall effect of sex).
