I just "happened" to be channel surfing and
stopped to listen to Brit Hume when he stated
this.
By the way those who like to do something for people with dementia can visit them in nursing homes.I happen to do this once a week. The patients are at various stages. Some for instance have some long-term memory that you can use for conversation.You will go home with the wonderful feeling that you got much more out of it than you put into it.