However, the validity of the idea of a "national psychology" has been strongly criticized, for political, moral and scientific reasons. Part of the problem is also that researchers usually interpret another culture from the point of view of the culture they are used to (regarded as "normal"). Even if many people in a country share a common psychological or biological characteristic, other people in that country may not share that characteristic at all. The important ways in which people differ may outweigh the common characteristics which they can all be proved to share. Psychologists have found in research that when subjects are asked to identify the
ethnicity or nationality of individuals by observing a line-up of different people, they cannot accurately recognize what their ethnicity or nationality is.
Marketing and
Media experts have found that at most people can identify a representative
stereotype,
archetype or
caricature which
symbolises a particular ethnic group, or characteristic ways of relating which a nation has. Some additional complications are, that: • the
mentality of a nation may change over time, through shared experiences, and therefore that the characteristics which are thought to be "typical" of a nation may change over time. In modern society, often the young generation no longer identifies with the ways of the old generation, including their ideas of national identity and norms. • large-scale
international migration of peoples from different nations means that immigrants take on part of the habits and culture of the country to which they move, while also retaining part of their original culture. In this way, different national cultures are merged or mixed, and a new culture may be formed which has no clear "national" identification. This, together with the growth of international
tourism, also means that people in one country increasingly adopt customs and habits from other countries, so that a
nationally distinctive culture declines. • When there are fights about identity, when people feel insecure about their identity, or when they try to get their identity accepted by others, a lot of people may claim they have important characteristics in common, or that they differ greatly from others, even although there is in truth little objective evidence for it. A fairly large "national movement" may appear of people sharing a national belief, even although in reality they do not have all that much in common. That is, people's desire to
feel that they have something in common, makes them act "as though" it already exists, even though this is not really true. Because of all these difficulties in defining national psychology, often the most insightful portrayals of it are not really "scientific", but are found rather in the
metaphors of fiction, for example in
novels and
films. These can gives insight into the "typical" emotional and intellectual world of a people, without pretending to apply to all its members. ==Globalization and postmodernity==