  Suppose we try to explain the public behavior of a person by describing how they represent,conceptualize or think about their situation.  Suppose they conceive or think of their situation in a certain way, not as bare, as filled with items without attributes, but as things, as trees, as people, as walruses, walls, and wallets.  Suppose, we also say, a person never merely interacts with their environment; but rather interacts with their environment as they perceive, see, or represent it. So, for example, thinking of something as a wallet, a person reaches for it.  Perceiving something as a walrus, they back away from it. Classifying something as a wall, they don’t bump into it. So understood, behavior is endogenously produced movement, viz. behavior that has its causal origin within the person who thinks of or represents their situation in a certain way.