The research on deja vu's opposite, jamais vu, recently won an Ig Nobel Prize. It's that feeling when something that you have done routinely before starts becoming unfamiliar. I have certainly experienced deja vu before, but I don't think I have ever felt jamais vu, so I think it goes much deeper into our psyche and it might be even more serious than deja vu which I would often just pass off as a happy surprise or coincidence. I can move from it, but I guess if I were to experience jamais vu, it would be more disconcerting. The only thing I can think of that might be similar would be if someone were to forget how to walk or ride a bike. Ian Sample, of The Guardian, discusses the science behind jamais vu on this podcast with Dr. Akira O'Connor, one of the researchers into jamais vu.
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