Mental Representations: The Expert’s Internal Map

The cognitive structures that separate expert performance from prolonged repetition

What are mental representations and how do experts build them through practice?

Mental representations, as described by Anders Ericsson in "Peak," are the internal cognitive structures that experts use to plan, monitor, and self-correct their performance in real time. Unlike novices, who hold general knowledge, experts hold richly detailed domain-specific models that make their performance faster, more accurate, and more self-correcting. These representations are built through deliberate practice and they, in turn, make further practice more efficient.

Ericsson’s central argument in "Peak" is not just that experts practice more — it is that they practice differently, and the result is a different kind of internal structure. A chess grandmaster does not "see" the board as 64 squares with pieces on them; they see it as a small number of meaningful patterns with implications. A concert pianist does not hear notes; they hear phrases, tensions, releases. These representations are the mechanism of expertise, and building them is the goal of deliberate practice. Below are the core practices, with honest evidence assessments.