http://goo.gl/udKxyJ
13 of 30 patients in a minimally conscious state—defined by occasional moments of low-level awareness—showed measurable gains in their responses to questions and sensory stimuli. Some had only recently been injured, but others had been minimally conscious for months.
The improvements lasted just a few minutes, but researchers are encouraged—the tDCS apparatus is inexpensive, easy to use, safe and lacking in side effects. Laureys is planning new studies to see if the stimulation can be configured to spur a more lasting recovery. Even if the effects remain temporary, the ability to trigger a brief period of awareness could be invaluable, perhaps allowing patients to communicate in a meaningful way with their loved ones.