A person's behaviours, states and internal representations are all interlinked at any given time. For example, you can say that "behaviour = internal representations + state" (of course, the "=" and "+" operations aren't mathematical, they rather mean "imply" and "and"). You can put this in any way. Another example: "state = behaviour + internal representations".
This concept has deep implications, which found many other higher level NLP techniques. It means that someone's state can be modified simply by modifying his internal representations (which can be done during conversation). Or, you can modify one's behaviour by modifying is state.