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Abstract
Reliability analyses were computed for the Luria-Nebraska Neuropsychological Battery (LNNB) summary and localization scales using coefficient alpha as a measure of internal consistency. Separate reliability analyses were carried out for a mixed group of brain-damaged patients and neurologically normal groups of psychotic (schizophrenic or schizoaffective disorder) and alcoholic patients. The basic LNNB summary scales appeared to have adequate internal consistency for the three groups sampled. The localization scales were internally consistent for the mixed brain-damaged group, but caution was urged in the use of these scales with the psychotic and alcoholic groups in clinical practice. Their further experimental development was encouraged. Use of ipsative comparison tables based on mixed psychiatric and brain-damaged patients were recommended for clinical use only with mixed brain-damaged patients.