Can patients who are brain-injured and seem unresponsive really still have active brains?

"The researchers used electroencephalography or EEG to look for signs of brain activity in a group of brain-injured patients, finding that 15% of those studied had residual activity despite being unable to speak or move.

EEG is already used to diagnose epilepsy and other brain disorders, but this study shows that EEG recordings can be used to detect what some researchers call "preserved consciousness" in some unresponsive patients with a severe brain injury. This method might make it easier for doctors to predict whether a brain-injured patient will wake up from a coma and might help inform decisions related to withdrawal of life-support."

The hope is that doctors can get better at predicting who recovers from a coma and who doesn't.