Apparently, people in vegetative states—people often taken off life support—can understand questions and can try to answer.
With one patient - a Belgian man injured in a traffic accident seven years ago - they asked a series of questions.
He was able to communicate "yes" and "no" using just his thoughts.
The team told him to use "motor" imagery like a tennis match to indicate "yes" and "spatial" imagery like thinking about roaming the streets for a "no".
The patient responded accurately to five out of six autobiographical questions posed by the scientists.
For example, he confirmed that his father's name was Alexander.
Fascinating.
from Vegetative state patients can respond to questions on the BBC
