Our view of the mind not only shapes our view of ourselves; less obviously, it also shapes our view of that part of our experience we conceive of as dealing with the external world. As we learn about the structure of this aspect of experience, we find that the world presents itself to consciousness only after being mediated to lesser or (more often) greater extents by mental structures and processes.

Truly to realize the ambitions of a science of mind does not solely involve learning about such issues as how we know, perceive and solve problems; it involves finding out tow hat extent the world outside us is knowable by us, and indeed prescribing the limits of inquiry for disciplines like Physics which claim to afford knowledge of the external physical world.