Lightly stimulating the brain with electricity may improve short-term memory in people with schizophrenia, according to a new study. The procedure, known as transcranial direct current stimulation, involves placing sponge-covered electrodes on the head and passing a weak electrical current between them. It is widely regarded as safe, and the procedure is being studied as a treatment for depression and Alzheimer's-related memory loss, and to enhance recovery following strokes.