Skip to main content
. 2022 Nov 24;16:1035350. doi: 10.3389/fnbeh.2022.1035350

FIGURE 6.

FIGURE 6

Males exhibit higher levels of non-reinforced active lever pressing than females under LgA self-administration conditions. Non-reinforced active lever pressing is expressed as: [(non-reinforced active lever presses—infusions)/infusions]. Data are shown as non-reinforced active lever pressing per self-administration day (d1–22) for LgA (A), ShA (B), and Sal (C) escalation phase treatment groups and as the total of non-reinforced active lever pressing during the escalation phase (d9–22) for LgA (D), ShA (E), and Sal (F) escalation phase treatment groups. Under LgA conditions, non-reinforced active lever pressing depended on main effects of Sex and Day (A), with males showing significantly higher responses than females (D); unpaired t-test). #p < 0.05, ##p < 0.01, main effects of sex and day, as indicated; *p < 0.05 unpaired t-test. N: LgA (22 females, 26 males); ShA (15 females, 13 males); Sal (10 females, 9 males).