Craik published only one complete work of any length, this essay on The Nature of Explanation. Here he considers thought as a term for the conscious working of a highly complex machine, viewing the brain as a calculating machine which can model or parallel external events, a process that is the basic feature of thought and explanation. He applies this view to a number of psychological and philosophical problems (such as paradox and illusion) and suggests possible experiments to test his theory.
As a contribution to the solution of some philosophical problems in experimental and scientific terms, this book is of interest to those concerned with concepts of brain and mind, whether psychologists, biologists or philosophers.