Origin of Deja Vu Pinpointed

The brain cranks out memories near its center, in a looped wishbone of tissue called the hippocampus. But a new study suggests only a small chunk of it, called the dentate gyrus, is responsible for “episodic” memories—information that allows us to tell similar places and situations apart. ...

http://www.livescience.com/health/070607_deja_vu.html