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CWM errors (Mean ± SEM) in rats treated with MDMA from P11-20 with the same dose given either as a single dose of 40 mg/kg, two divided doses of 20 mg/kg, or as four divided doses of 10 mg/kg. The 2 dose group was given each dose 6 h apart and the 4 dose group was given one dose 2 h intervals per day. Rats were tested under red lighting using unassisted escape. Note how rapidly rats learn the maze even with lighting barely visible for humans. From (Vorhees et al., 2008).
