A new study uses MRI scans to understand why, neurologically speaking, some people are so into the holiday spirit, while others seem to lack it entirely. To reach their findings, study coauthor Anders Hougaard, of the University of Copenhagen in Denmark, and colleagues used functional magnetic resonance imaging (fMRI) to scan the brains of 20 adults. The report says that people who enjoy Christmas have measurably different activity in certain areas of the brain. On the flipside, silence in this “Christmas network” may be associated with a decided Scrooginess, which may or not be treatable.