If someone were in a coma after an accident, and you wanted to better understand

If someone were in a coma after an accident, and you wanted to better understand how “conscious” or aware s/he were, how might you go about it?
Please post an original post by Wednesday at 11:59pm with proper peer reviewed references in proper APA format with a reference list in proper APA format. A response to two original students must be posted by Friday night at 11:59pm using peer reviewed references in proper APA format and listing of references in proper APA format to get full credit on this discussion this week. Please make sure to use only peer reviewed references. 50 points for this discussion.