CONCEPT
Expert Mental Representations
Ericsson's term for the elaborate internal architectures — pattern libraries, procedural schemas, and embodied knowledge — that experts construct through deliberate practice and that enable perception, anticipation, and judgment invisible to the novice.
Expert mental representations are the cognitive structures that distinguish the expert from the merely experienced practitioner. They are not stored propositions but rich, flexible, deeply interconnected internal models of a domain that encode not just what things are but what they mean, imply, and demand. The chess master perceives a board not as thirty pieces but as a small number of meaningful chunks laden with strategic implication. The surgeon feels the difference between healthy and diseased tissue through proprioceptive signals invisible to the observer. These representations cannot be transferred directly; they must be constructed from the inside through the specific friction of deliberate practice. AI's capacity to produce expert-level output without requiring their construction is the central concern of Ericsson's framework applied to the present moment.
In The You On AI Field Guide
The research foundation for mental representations comes from de Groot's 1946 chess studies, extended in the 1970s by Chase and Simon's work on chunking. When