“When we have déjà vu, we don’t act on it,” Moulin says. “But these people refused to watch television, they stopped reading the newspaper.” The patients were what cognitive scientists call “anosagnosic” — unaware of their condition. They also found situations to be more than just familiar; they believed that they were really recalling them, so much so that they invented memories to justify that belief. They were, to use Tulving’s phrase, time traveling to a reality that had never existed.

– Déjà Vu, Again and Again, a fascinating NYT article from 2006 (via).