ANOVA	analysis of variance
BSA	bovine serum albumin
CA	conditioned activity
cAMP	cyclic adenosine monophosphate
CPP	conditioned place preference
CREB	cAMP response element-binding protein
DARPP-32	dopamine-regulated phosphoprotein-32
i.p.	intraperitoneal
Icv	intracerebroventricular
NAc	nucleus accumbens
NFDM	non-fat dry milk
pCREB	phosphorylated cAMP response element-binding protein
pDARPP-32	phosphorylated dopamine-regulated phosphoprotein-32
PKA	protein kinase A: cAMP-dependent protein kinase
pPKA	phosphorylated protein kinase A
RIPA	radioimmunoprecipitation assay
RT	room temperature
SI	social interaction
TBST-T	tris-buffered saline with Tween 20