Table 2.

Behavioral data on the reversal learning task (mean proportion correct ± SD)

		Cocaine		Placebo		Cannabis
		A2/A2	A1 car	A2/A2	A1 car	A2/A2	A1 car
		(N = 42)	(N = 17)	(N = 42)	(N = 17)	(N = 33)	(N = 13)
Unexpected reward	Switch	0.91 ± 0.091	0.92 ± 0.087	0.88 ± 0.11	0.84 ± 0.10	0.83 ± 0.15	0.77 ± 0.19
	Non-switch reward	0.95 ± 0.061	0.95 ± 0.039	0.92 ± 0.074	0.91 ± 0.038	0.90 ± 0.080	0.85 ± 0.12
	Non-switch punishment	0.95 ± 0.049	0.94 ± 0.070	0.92 ± 0.089	0.90 ± 0.060	0.91 ± 0.059	0.86 ± 0.094
Unexpected Punishment	Switch	0.96 ± 0.045	0.95 ± 0.051	0.92 ± 0.088	0.87 ± 0.11	0.85 ± 0.17	0.84 ± 0.14
	Non-switch reward	0.95 ± 0.050	0.95 ± 0.034	0.93 ± 0.044	0.91 ± 0.056	0.89 ± 0.079	0.86 ± 0.10
	Non-switch punishment	0. 95 ± 0.051	0.96 ± 0.044	0.93 ± 0.051	0.90 ± 0.054	0.90 ± 0.069	0.88 ± 0.047