The most recent agenda-setting studies explore "the extent to which the news media can transfer the salience of relationships among a set of elements to the public". That is, researchers assume that the media can not only influence the salience of certain topics in public agenda, but they can also influence how the public relate these topics to one another. Based on that, Guo, Vu and McCombs (2012) bring up a new theoretical model called Network Agenda Setting Model, which they refer to as the third-level agenda-setting. This model shows that "the news media can bundle sets of objects or attributes and make these bundles of elements salient in the public's mind simultaneously". In other words, elements in people's mind are not linear as traditional approaches indicate; instead, they are interconnected with each other to make a network-like structure in one's mind; and if the news media always mention two elements together, the audience will "perceive these two elements as interconnected".