THE ROLE played by minimal brain dysfunction in the psychopathology of hospitalized psychiatric patients has been increasingly investigated recently, eg, Pollack,1 Hartocollis,2 Quitkin and Klein.3 One major difficulty in investigating this matter has been the relative scarcity of procedures sensitive to brain damage which can be routinely used in psychiatric hospitals. (Although the electroencephalogram is quite useful in assessing possible brain damage in patients, practical economic factors make it likely that the EEG will be used for only a small percentage of hospitalized psychiatric patients.) If a psychometric test were available, which when routinely administered to psychiatric Patients could concentrate a sample very likely to have brain dysfunction (and, therefore, abnormal EEGs), such a test could be useful in assessing the role played by brain dysfunction in the patient's symptoms. Although psychometric tests, tests of abstraction,