WHEN LESS IS MORE - REPRESENTATION AND SELECTIVE MEMORY IN EXPERT PROBLEM-SOLVING

Few studies of problem-solving expertise in professional domains have undertaken independent assessments of how domain-specific knowledge co ntributes to the development of problem representations as well as sub sequent memory for task information. These issues were investigated in the present study by asking participants at three levels of training and experience (novice, trainee, and expert) in a medical specialty to solve two complex diagnostic problems (patient cases) selected from m edical records of a university hospital. The subjects were also asked to provide an incidental free recall of the patient information contai ned in each case immediately after problem solving and one week later. Problem representations (identified as ''lines of reasoning'') used b y each subject in each case were determined from an analysis of thinki ng-aloud protocols generated during problem solving. The three groups did not differ on the overall amount of case information recalled at t he immediate retention test and did not show selective recall for info rmation statements that were directly relevant to the lines of reasoni ng used during problem solving. After one week, however, the expert ph ysicians remembered fewer information units than novices but showed se lective retention for case information contained in the lines of reaso ning used to reach a diagnosis. Experts also increased their recall of specific diagnostic interpretations contained in their initial proble m-solving experience while novices did not demonstrate evidence of the ir problem representations in recalling case information.