Fig. 1.

Dose-effect functions for Δ⁹-THC alone (black symbols) and following treatment of 1.0 mg/kg of rimonabant (shaded symbols) on repeated acquisition (RA) trials (circles), discrimination reversal (DR) trials (triangles), and discriminative capability (DC) trials (diamonds). Abscissa, cumulative dose, log scale; ordinate, mean percent correct. Symbols left of abscissa break indicate performance during noninjection control (C) and saline (S) sessions. Points represent averages (±S.E.M.) for the groups of subjects; n = 5, *P < 0.05, **P < 0.01.