Final answer:
Central vasopressin V1a receptor activation is independently necessary for both partner preference formation and expression in social monogamous male prairie voles.
Step-by-step explanation:
Research has shown that central vasopressin V1a receptor activation is independently necessary for both partner preference formation and expression in social monogamous male prairie voles. This means that the activation of this specific receptor plays a crucial role in the development of the preference for a specific partner as well as the actual expression of that preference.
In experiments with prairie voles, blocking the vasopressin V1a receptor has been found to prevent the formation of a strong preference towards a particular partner. Additionally, blocking the receptor after the preference has already been formed can diminish the expression of that preference.
This research is important in understanding the neural mechanisms underlying social monogamy and mate choice in mammals. It provides insights into the role of vasopressin and its receptors in shaping social behavior and attachment.