This study compared the predictive accuracy of 3 commonly used tests for organicity: Bender Gestalt, Benton Visual Retention, and Graham-Kendall Memory-for-Designs. Each of the 147 patients admitted to the hospital during the experimental period was approached for testing. Complete data were obtained from 120 patients later classified as Chronic Brain Syndrome, Acute Brain Syndrome, Psychosis, Personality Disorder, Chronic Alcoholism, and Other. Results showed that test performance is not related to race or sex, but is significantly related to age, IQ, and education. When the effects of these variables were statistically controlled, performance on all measures predicted the clinical diagnosis of organicity at less than the .001 level of significance. The best single measure was the Bender which, scored by the Hutt-Briskin method, correctly identified 82% of all patients. (20 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)