Evolutionary theories make predictions about universal features of the mind as well as culturally-contingent expressions of that design. For both these reasons, it is important to test the central tenents of the recalibrational theory of anger on a diverse sample of cultures and to explore aspects of anger that respond to different ecological circumstances or cultural norms.
Furthermore, if anger is indeed an adaptation designed by natural selection over evolutionary time then its computational pieces were selected in environments very different from modern industrial nations. By studying individuals from foraging societies we can observe and test anger mechanisms in environments more closely related to those in which anger evolved.
Different predictions of the recalibrational theory have been tested among many different people around the world with the aid of a commited group of anthropologists, psychologists, and political scientists.