You might have felt it -- the feeling that you've experienced something before, but, in reality, the experience is brand new. There are over 40 theories that attempt to explain the phenomenon of déjà vu. Michael Molina explains how neuroimaging and cognitive psychology have narrowed down the theories that could explain that feeling you're having...again. [Directed by Josh Harris, narrated by Michelle Snow].

Michael Molina: What is déjà vu? What is déjà vu?

What is déjà vu? What is déjà vu?

Déjà vu theories range from dual processing delays to memory holograms, reflecting the brain's complex processing capabilities.

The hologram theory suggests déjà vu occurs when our brain recognizes a fragment of a memory, not the full picture, causing familiarity.

Divided attention theory posits déjà vu arises when we subliminally record an environment while distracted, feeling familiar upon refocus.