Table 4.

Prevalence of NAc responses before and after the drug-free period

	Before		After
	0 mg/kg	0.25 mg/kg	0 mg/kg	0.25 mg/kg
Excitatory CS+
Long-lasting	12 (18%)	11 (18%)	16 (23%)	14 (25%)
Transient	3 (4%)	4 (7%)	4 (6%)	1 (2%)
Inhibitory CS+
Long-lasting	15 (22%)	10 (16%)	16 (23%)	15 (26%)
Transient	0 (0%)	2 (3%)	2 (3%)	5 (9%)
Excitatory CS−
Long-lasting	6 (9%)	7 (11%)	10 (14%)	11 (19%)
Transient	4 (6%)	3 (5%)	3 (4%)	5 (9%)
Inhibitory CS−
Long-lasting	3 (4%)	2 (3%)	3 (4%)	3 (5%)
Transient	1 (1%)	0 (0%)	0 (0%)	1 (2%)
Excitatory US	15 (22%)	11 (18%)	16 (23%)	17 (30%)
Inhibitory US	27 (40%)	24 (39%)	21 (30%)	18 (32%)
Total	68	61	70	57