I'm not sure how much help it will be, but when I did a term paper on video games, a great book my friend had entitled Game Over was used for the bulk of my information. It's a very, very good book, mostly about the rise of Nintendo, starting from its beginnings in the 19th century, but I believe there are some parts in it about video games and their effects on users. I've actually tried to find this book to buy it, but I've heard it was out of print. I'd love to be able to find a copy, though.