Table 2. Expression Studies.

Experimental design for studies testing effects of dopamine D₁ (SCH 23390, 1 µM) and D₂ (sulpiride, 1 µM) receptor antagonists on the expression of 1% sucrose place conditioning.

Group	Pretest (5 min)	Conditioning (30 min)	Posttest (5 min)
Water/Water	Water	Water	Water
Water/Antagonist	Water	Water	Antagonist
Sucrose/Water	Water	Sucrose	Water
Sucrose/Antagonist	Water	Sucrose	Antagonist