The terms the robot uses to refer to entities need to correspond to the entities so that the sentences will express facts about these entities. We have in mind both material objects and other entities, e.g. plans. As with science, a robot's theories are tested experimentally, but the concepts robots use are often not defined in terms of experiments. The important consequence of the correspondence theory is that when we design robots, we need to keep in mind the relation between appearance , the information coming through the robot's sensors, and reality . Only in certain simple cases, e.g. the position in a chess game, does the robot have sufficient access to reality for this distinction to be ignored.
Some robots react directly to their inputs without memory or inferences.
A robot that reasons about the acquisition of information must itself be aware of these relations. In order that a robot should not always believe what it sees with its own eyes, it must distinguish between appearance and reality. 20th century corrections to scientific knowledge mostly left the old scientific theories as good approximations to reality. The human mind is an activity of the human brain. This is a scientific proposition, supported by all the evidence science has discovered so far.