 Other approaches also see social categories as being set up by the distributed mental states of members of a society. Many of these theories are less specific about the particular states that individuals must be in. Husserl (1936, 1950) argues that how an individual represents an object depends, in part, on the presupposition that others are representing it as well. Individual empathy for the representations of others plays a part in how the individual herself constructs representations. The representations of objects in a society, therefore, are a product of harmonized mental states among its members. But these mental states are not required to be attitudes or dispositions. Other theorists associate different mental characteristics with structuring social categories. Berger and Luckmann (1966), for instance, regard the identification of people in a society with social roles as central to the characteristics of those roles.