scientists have shown that using deep brain stimulation -lrb- dbs -rrb- , a technique already used to treat parkinson 's disease .
researchers now believe it could be used to improve brain function and ward off diseases such as dementia -lrb- file image -rrb- .
it found new brain cells , neurons , can be formed by stimulating the front part of the brain known as the prefrontal cortex which is involved in memory retention using minute amounts of electricity that