A Christmas spirit network in the brain In this (somewhat ironically written) study, the authors used magnetic resonance imaging to localize the Christmas spirit in the human brain (Hougaard et al., 2015). To this end, they investigated 10 people who celebrated Christmas and 10 people without a Christmas tradition. Participants were shown Christmas-themed pictures while their brains were scanned in an MRI machine. The result: People that celebrated Christmas showed increased brain activity when