The brain is so complex no-one can determine exactly what we are aware of.
What I do know is my ex husband was in an induced coma due to a severe head injury for which he suffered brain damage.. I read to him and visited him daily . He was totally unresponsive , he remembers nothing from before his accident which from start to leaving hospital was a number of months , but he did make a near full recovery , that is from brain damage too ..
I totally believe people in comas can not necessarily comprehend whats going on , but if they can hear you or smell you , your voice and aroma would be soothing to them and have a healing effect maybe. Or if they can't hear or see you we have other senses that may become heightened when our main senses fail and they are aware you are present even if they cannot hear ,feel, smell or remember you were there .
One thing that I will never forget is meeting a person who is 'brain damaged' , totally unable to communicate with you or I or do anything for himself... when he was 17 his mother found out about a means of communication where you steady the persons arm and they point at letters ... bearing in mind this lad had never spoken a word or communicated had no education to speak of.
Through this new method of communication he learned at 17 he was able to now tell people things about what happened in his childhood , this is a person who many people would have referred to as a cabbage.... I met this person ... I found it hard to believe he could communicate in this manner but I saw it for myself.
He then went on to do a degree using this method of communication... and I can tell you if you saw him you would not believe it....
The point is what we see is not always the full picture ... and the brain although it may not work in some areas other areas compensate and at the end of the day there is more to a body , that is just a shell. I believe we all have a spirit/soul and that is also responsive to people when our brain doesn't function so well.
Hope you are all recovering well btw <3
Lisa <3