Besides memory, we also have a meta-memory, storing everything we remember (or should remember) and everything we don't. The resemblance of the brain, or rather the memory unit, to a computer is becoming more and more obvious. What's ironic is that the brain has an analogy to a list of lists! This meta-memory is responsible for the deja vu effect and "what's the name of that actor who was there?" Researchers have found that such a filing cabinet is located in our prefrontal cortex.