The purpose of this study was to validate the results obtained by Watson, Gasser, Schaefer, Buranen, and Wold (1981) by utilizing the Smith Symbol‐Digit Modalities Test (Form W) and the MMPI (Psychiatric‐Organic) scale in combination. Forty recently admitted/readmitted male patients were given both the SDMT and the MMPI (P‐O) at a point in their hospitalization in a private inpatient psychiatric hospital in Puerto Rico. The combined use of the Smith and the P‐O scale, with the criteria originally developed by Watson et al. (1981), provided a modest level of discrimination by correctly identifying 80% of the brain‐damaged sample (orgainc group) and 55% of the functional sample (psychiatric group) subjects. This combination of tests yielded an overall mean hit rate of 67.5%. These results moderately support the findings obtained by Watson et al. (1981).