The pioneering work in the field of pair bonding by Thomas Insel and his group (Insel and Young 2001, Young and Wang 2004) has documented  the marked rise in the density of the oxytocin receptors all over the entire nuc acumbens and the dorsal striatum of the monogamous prairie vole compared with the polygamous montane vole. The partner preference formation in the mating female prairie vole is blocked through infusions of an oxytocin receptor antagonist  into the nuc accumbens and the prefrontal cortex but not into the dorsal striatum.It is highly