Abstract
The relationships between test performance, cognitive constructs, and underlying neurological status are examined. It is concluded that, while there are many tests that are sensitive to dysfunction in a given cortical area few are specific to such dysfunction. This is particularly true in the case of behavioral functions mediated by the frontal lobes. Modern clinical neuropsychology represents a fusion of experimental and correlational approaches in both research and practice. A serious time lag exists in the execution of seminal research and its application in clinical practice. The use of small collaborative data banks in reducing this time lag is discussed.