The concept of a mental map refers to a person's personal point-of-view perception of their own worl. Although this kind of subject matter would seem most likely to be studied by fields in the social sciences, this particular subject is most often studied by modern day geographers in order to determine from the public such subjective qualities as personal preference and practical uses of geography like driving directions. Mass media also has a virtually direct affect on a person's mental map of the geographical world. The perceived geographical dimensions of a foreign nation (relative to one's own nation) may often be heavily influenced by the amount of time and relative news coverage that the news media may spend covering news events from that foreign region. For instance, a person might perceive a small island to be nearly the size of a continent, merely based on the amount of news coverage that he or she is exposed to on a regular basis.