The eerie sensation of \u201cd\xe9j\xe0 vu\u201d -- feeling a strong sense of familiarity in a new place or situation -- is one of memory\u2019s strangest tricks. Researcher Chris Moulin, PhD, of Grenoble Alpes University, talks about why d\xe9j\xe0 vu happens; why both d\xe9j\xe0 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 d\xe9j\xe0 vu; how he and others study d\xe9j\xe0 vu and jamais vu in the lab; and what these experiences can teach us about memory more broadly.\nFor transcripts, links and more information, please visit the Speaking of Psychology Homepage.\nLearn more about your ad choices. Visit megaphone.fm/adchoices