Are Games Changing Our Brains?

From a colleague, quite a strong hypothesis. At a gut level I do feel there are changes going on, but I would like to see more evidence:

" ... Electronic devices and pharmaceutical drugs all have an impact on the micro- cellular structure and complex biochemistry of our brains. And that, in turn, affects our personality, our behaviour and our characteristics. In short, the modern world could well be altering our human identity ... "