I can sort of understand this. Games aren't the only think that tend to temporarily effect the way you think, but due to it engaging a lot more of our senses/mind than any other entertainment medium, it makes sense that more would bleed over. But, I can read a book for a few hours, and by the time I'm done, for the next hour or so, my thoughts will follow the writing patterns of the book.
I think it has to do with how we adapt to allow ourselves to process the information the best we can, and afterwords, we have to adapt back.