Roland Piquepaille writes: "According to researchers at the University of California at San Diego, visual areas of our brain respond more to valuable objects than other ones. In other words, our brain has stronger reactions when we see a diamond ring than we look at junk. Similarly, our brain vision areas are more excited by a Ferrari than, say, a Tata new Nano car. In this holiday season, I'm sure you've received gifts that excited your brain — and others that you already want to resell on an auction site. Read more for additional details, references and a picture of hot spots showing our brain's neural activity when we're excited."