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Dr Chris Moulin is a cognitive neuropsychologist at the Universit茅 de Bourgogne, Dijon, France. He researches the science of d茅j脿 vu.聽

"D茅j脿 vu is a fault in a kind of cognitive process that is going on in the background all the time. When it goes wrong, it's very striking," says Moulin. 鈥淎t the extreme, patients with permanent d茅j脿 vu - dubbed d茅j脿 v茅cu, for already experienced - actually make up stories to make sense of it鈥�.

He believes that d茅j脿 vu is caused not by genuine memories but erroneous activity in the brain.

Anne Cleary is a Professor of Cognitive Psychology at the Colorado State University.

Anne thinks that d茅j脿 vu has environmental influences鈥攖hat is, external situations that trigger a reaction in the brain, and that genuine (not just false) memories and familiarity play a big part in its makeup.

Chigozie Obioma was born in Nigeria. He now lives in the United States where he is a Fiction Fellow at the University of Michigan.

His novel 鈥楾he Fisherman鈥� is told from the point of view of nine-year-old Benjamin, the youngest of four brothers. The book is the Cain and Abel-esque story of a childhood in 1990s Nigeria and deals with themes of familiarity, repetition and memory.

Chigozie is interested in deja vu both as a writer and from the perspective of his Nigerian heritage.

Chris Moulin wants to preserve memories of friends and family.

鈥榃e have long thought that memory is the storehouse of our identity: we聽are聽our memory. But what about other people鈥檚 lives? 聽How do we best remember somebody else? This question is never more important than for our friends and family who have died. 聽I think that memory research and technology has a lot to contribute to how we can better remember someone else鈥�.聽