The term was coined by Jacques-Philippe Leyens and colleagues in the early 2000s to distinguish what they argue to be an everyday phenomenon from dehumanization (denial of humanness) associated with extreme intergroup violence such as genocide. According to Leyens and colleagues, infrahumanisation arises when people view their ingroup and outgroup as essentially different (different in essence) and accordingly reserve the "human essence" for the ingroup and deny it to the outgroup. Whether a "subhuman" classification means "human but inferior" or "not human at all" may be academic, as in practice it corresponds to prejudice regardless (for example, compare the Nazi idea of the Untermensch).