The eerie sensation of “déjà vu” -- feeling a strong sense of familiarity in a new place or situation -- is one of memory’s strangest tricks. Researcher Chris Moulin, PhD, of Grenoble Alpes University, talks about why déjà vu happens; why both déjà vu and its lesser-known opposite, jamais vu, may actually be signs of a healthy memory at work; why young people are more prone to déjà vu; how he and others study déjà vu and jamais vu in the lab; and what these experiences can teach us about memory more broadly. For transcripts, links and more information, please visit the Speaking of Psychology Homepage. Learn more about your ad choices. Visit megaphone.fm/adchoices