Table 1.

Group Nomenclature and Treatments

Conditioning Phase - Group Designation	Group N	CTA Conditioning		Extinction Phase – Group Designation	Group N	Extinction Training		30-day Latency before SR test	SR Group N	SR Test Solution
		Days 1, 3, 5	Days 2, 4, 6			Odd Days	Even Days
CTA	23	SAC3 + LiCl4	H2O	CTA+EU- EXT 1	11	SAC	H2O+LiCl	H2O	5	SAC
				CTA+CSO- EXT 2	12	SAC	H2O+ SAL5	H2O	6	SAC
NO CTA	24	SAC	H2O + LiCl	NO CTA+ “EU-EXT”	12	SAC	H2O+LiCl	H2O	6	SAC
				NO CTA+ “CSO- EXT”	12	SAC	H2O+ SAL	H2O	6	SAC

¹CTA-EU-EXT = “Explicitly Unpaired” extinction procedure in which both the CS and US are presented on alternate days

²CTA-CSO-EXT = “Conditioned Stimulus Only” extinction procedure in which only the CS is presented every other day

³SAC = saccharin salt dissolved in DI H₂O (0.3% w/v; p.o.)

⁴LiCl = lithium chloride injection dissolved in sterile, physiological saline (81mg/ml; 81mg/kg; i.p.)

⁵SAL= sterile, physiological saline (0.9% w/v, NaCl; 1ml/kg; i.p.)