The first four levels direct interactions with the environment and are what might traditionally be termed sensory, perceptual, and motor processes. The upper two levels are involved in creating internal symbolic representations of the world and control the metacognitive functions that manipulate those representations. Any behavior, it is argued, involves processes at many of these levels and cannot be described as the result of any single system.
Spatial cognition is too broad to be accomplished by a single system or set of procedures.
Rather, the SRS account shares Velichkovsky's multisystem view. 1.4 Velichkovsky's analysis exposes where the SRS account is incomplete as a theory of spatial cognition. Both are necessary for a theory that explains broader aspects of spatial cognition. A complete specification of the SRS's role in spatial cognition would include action and metacognitive systems. They certainly interact with the language system because we are able to verbalize our representations of environments.