Lately, a clutch of studies have come emerged that seem to provide more empirically supported insights into déjà vu. These studies look into cases of chronic déjà vu: cases involving people who are certain that almost everything they do or sense is not new to them. In fact, this condition can be debilitating.
Take, for example, this anecdote from Dr. Chris Moulin, a professor who studies memory at the Pierre Mendès-France University in Grenoble. “We had a peculiar referral from a man who said there was no point visiting the clinic because he’d already been there,” he told the University of Leeds, England, newsletter The Reporter in 2006.