preference: grant of favor or advantage to one over another (especially to a country or countries in matters of international trade, such as levying duties)
advantage: the quality of having a superior or more favorable position
hippocampus: a complex neural structure (shaped like a sea horse) consisting of grey matter and located on the floor of each lateral ventricle; intimately involved in motivation and emotion as part of the limbic system; has a central role in the formation of memories