Effects of 18-MC (10, 20, and 40 mg/kg i.p.) on the consumption of water during the baseline session, postinjection session, and a recovery session (mean±SEM). “Averaged baseline” was calculated based on responses for 19 h sessions on day 1 and day 2; the averaged baselines were as follows (mean±SEM): 26.9± 1.7, 26.0±1.2, 23.8±1.4, and 25.6±1.6 for 0, 10, 20, and 40 mg/kg of 18-MC, respectively.*p<0.05, significant difference between drug vs. baseline, Fisher LSD tests