Researchers at the National Institute for Neurological Disorders and Stroke, in Bethesda, MD, are studying how applying gentle electrical current to the scalp can improve learning.
The transcranial direct current stimulation (TDCS), in which an electrical current is passed directly to the brain through the scalp and skull, uses a nine-volt battery which delivers a gentle 2 to 2.5 milliamps of current spread over a 20 to 50 square millimeter area of the scalp for up to 15 minutes.
Researchers found that direct current stimulation could improve memory in participants asked to learn and then recall a list of 12 words.
Emily Singer (2008) Want to Enhance Your Brain Power? Technology Review. Available at: http://www.technologyreview.com/Biotech/21007/