Fig. 5.

Test of passive avoidance learning: an avoidance memory retention test was conducted 24 h after rats had been trained once on a task of passive avoidance learning under either vehicle, almorexant, combo (both almorexant and scopolamine), or scopolamine treatment. Avoidance memory retention was intact in both vehicle and almorexant-treated rats (see text). Asterisks indicate step-through latency of the respective drug treatment group was statistically different from step-through latency of the vehicle group. Data are presented as mean ± standard error of the mean with 14–16 rats per treatment group