Cognitive anthropology takes a number of methodological approaches, but generally draws on the insights of cognitive science in its model of the mind. A basic premise is that people think with the aid of schemas, units of culturally shared knowledge that are hypothesized to be represented in the brain as networks of neural connections. This entails certain properties of cultural models, and may explain both part of the observed inertia of cultural models (people's assumptions about the way the world works are hard to change) and patterns of association.