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Does that give any indication of the state her brain is actually in? >> if in fact she was able to respond, hear some sort of command and make some sort of movement, in this case, blinking of the eye, to give some sort of communication, it would. a lot of times, it's hard to parse out someone is in fact responding to a particular thing or whether or not they're just blinking their eyes. people who are in persistent vegetative state can have sleep wake cycles, eye movements, all sorts of things. >> i want to bring in jeff in a moment. sanjay, there have now been studies, i did a thing on "60 mi...

Minutes" on this, and put people thought to be in comas, persistent vegetative states, inside mri machines and ask them to respond to things and see areas of their brain light up in response to what's being asked. and there is a level of cognition even though we don't know there is. in this case, why shouldn't this woman's kids come and may have some deep response to them? >> when it comes to this study you were talking about, this woman, i believe, in england, a traumatic brain injury, specific areas of the brain affected, and can render someone into a coma and seemingly unable to communicate...