summarizes the temporal pattern of experiments measuring chronic dose-response to MDMA (2.5, 5.0, and 10.0 mg/kg, i.p.) for HA. The values for each 10-minute bin are presented as the mean ± S.E.M. Significance for each bin is determined by comparing activity counts to the same temporal bin on Day 2 (saline day). *p < 0.05.