Dementia's effect on art

While reading Bruce Miller's article that talks about the relationships between art and dementia, I found it interesting that there are patients who are able to grow artistically even though they are suffering from dementia.  The article makes me whether or not my great grandfather, who is currently suffering from Alzheimer's , would do if he tried to focus on some form of art.  His case is very severe, most times forgetting the names of his children even though they see him often.  Usually, he is frustrated by his inability to remember certain details or dates.  The fact that it is possible for him to try to use art as a way to connect with the people around him is a thought that never crossed my mind.  Another interesting thing that I read was that damage to the nondominant hemisphere is more difficult to deal with because it is dominant for visual art, meaning that damage to it can cause major defects to a someone's creativity.