Table 1.

Rates of responding^§ under each experimental condition in Experiment 2.

Subject	Food- maintained (Before SA)	Extinction (Before SA)	Cocaine- maintained (0.03mg/kg/inj)	Food- maintained (After SA)	Extinction (After SA)
C-7078	1.69 ± 0.38	0.08 ± 0.09	0.33 ± 0.15	1.89 ± 0.17	0.03 ± 0.02
C-7079	4.74 ± 1.41	0.10 ± 0.15	0.51 ± 0.24	4.50 ± 1.05	0.06 ± 0.05
C-7083	3.26 ± 1.09	0.04 ± 0.01	0.58 ± 0.18	4.59 ± 0.66	0.04 ± 0.02
C-7423	2.12 ± 1.04	0.01 ± 0.01	0.27 ± 0.11	2.93 ± 0.29	0.10 ± 0.13
C-7424	2.52 ± 0.07	0.04 ± 0.04	0.28 ± 0.03	2.57 ± 0.43	0.05 ± 0.02
Group	2.87 ± 0.54	0.05 ± 0.02	0.39 ± 0.14	3.30 ± 0.54	0.05 ± 0.01

^§Individual data are expressed as mean ± SD of the last three sessions under each condition. Group data are expressed as mean ± SEM.