Quantitative measures of cognition, which are administered using a uniform procedure and interpreted in relation to the normal range of scores, are informative for clinical and investigative purposes. The distributions of test scores obtained from samples of neurologically intact persons of various ages and educational levels provide a reference for interpreting the results obtained from individual patients. Standard reference books, journal articles, and neuropsychological test manuals have disseminated information for scoring and interpreting the more widely used neuropsychological tests. 1-7 INDICATIONS FOR CLINICAL NEUROPSYCHOLOGICAL TESTING Clinical applications of neuropsychological testing include its use as an adjunct in the assessment of cerebral disease, such as in the evaluation of dementia and its differentiation from depression. Developmental disorders such as dyslexia require a detailed assessment of cognition, academic achievement, and psychosocial adjustment for identification and a guide to management. Apart from the assessment of patients with neurologic disease or injury, neuropsychological testing