: The resulting internal symbols are translated back into physical actions or used to recognize when a predicted external event has occurred. The Purpose of Explanation: Prediction and Survival
The original 1943 publication is approximately 124 pages long.
If you’d like, I can:
Craik outlined a specific three-step process for how these internal models work:
: External physical processes are converted into internal symbols, such as words or numbers. kenneth craik the nature of explanation pdf
The brain translates the internal conclusion back into physical action or prediction in the real world.
External processes are translated into neural patterns or "symbols" (similar to how a camera translates light into a digital file). : The resulting internal symbols are translated back
, introduced the concept of mental models, arguing that the human mind functions as a "calculating machine" to predict external reality. Craik proposed that thought consists of creating internal, symbolic models to simulate external processes and guide behavior. You can access a PDF version of the text on Farnam Street The Nature of Explanation - Farnam Street
More importantly, his central question— how can a physical system create an internal model that explains and predicts the world? —is now more urgent than ever. Large language models, robotics, and brain-computer interfaces all grapple with Craik’s core insight: to explain is to simulate. And to simulate is to survive. The brain translates the internal conclusion back into
We live in an era of "black box" AI—models so complex that even their creators don't know how they output a result. Reading is an act of intellectual grounding. It reminds us that before the teraflops and the transformers, there was a simple, beautiful idea: To understand is to simulate.