I have a theory about why that is.<p>In the book "Thinking, Fast and Slow" there are a number of experiments described that show that human thought can roughly be separated into two systems, one of which is intuitive, fast, heuristic, and low-energy, and the other which is rational, analytical, uses more calories, and is only engaged when necessary.<p>We use the first system most of the time, and only use the second system when we really need to. They found that when people were given something to read in a smaller font, their responses to it were more rational.<p>This might be the same effect - if the second system is already engaged due to the difficulty of understanding the other language, the result is a more rational response.<p>It's a very interesting book, and well done. It's a bit long, but thorough. <a href="http://en.wikipedia.org/wiki/Thinking,_Fast_and_Slow" rel="nofollow">http://en.wikipedia.org/wiki/Thinking,_Fast_and_Slow</a>