Seven of fourteen elderly female patients (mean age 82.3 [75-89] years) with abnormalities of cognition, memory and affect of organic causation were randomly assigned to be given cognitive training, especially relating to memory, as part of rehabilitation measures for medical or orthopaedic diseases. The other seven served as controls. Training extended over 15 days, cognitive training given on 9 days for 45 min each. The control group had sessions of nonspecific attention. All patients were given psychological tests of memory and attention before and after cognitive training (or nonspecific attention). Behavioural changes were also assessed. The patients with cognitive training scored significantly higher than the controls, both in the individual exercises of the training programme and in the various tests of performance. The cognitive training also favourably influenced social behaviour, mood and level of volition. Maintaining and improving still present mental capacity in this type of patient is an essential task within a hospital setting, which otherwise provides little stimulus. Cognitive training is simple and effective, yet of great social importance.