Table 1.

Activity counts in the drug-paired or control compartment during assessment of nicotine (0.1 mg/kg, s.c.) or saline after pretreatment with different doses of methoxsalen (15, 30 and 45 mg/kg, i.p.) or vehicle in the conditioned place preference (CPP) test. Values represent the total activity counts in the drug-paired compartment on test day (drug free) for each group and are presented as the average activity count on test day. Data are expressed as mean ± S.E.M. of n=6–8 mice/group.

Methoxsalen (mg/kg)	Saline	Nicotine
0	530 ± 69	512 ± 96
15	561 ± 83	524 ± 69
30	470 ± 105	488 ± 111
45	503 ± 89	513 ± 103