‘Michio Kaku, though best known for his work with physics, has some ideas of his own about what we experience when we experience déjà vu. “There is a theory,” says Kaku in the Big Think video above,”that déjà vu simply elicits fragments of memories that we have stored in our brain, memories that can be elicited by moving into an environment that resembles something that we’ve already experienced.
”But wait! “Is it ever possible on any scale,” he then tantalizingly asks, “to perhaps flip between different universes?” And does déjà vu tell us anything about our position in those universes, giving us signs of the others even as we reside in just one? Kaku quotes an analogy first made by physicist Steven Weinberg which frames the notion of a “multiverse” in terms of our vibrating atoms and the frequency of a radio’s signal: “If you’re inside your living room listening to BBC radio, that radio is tuned to one frequency. But in your living room there are all frequencies: radio Cuba, radio Moscow, the Top 40 rock stations. All these radio frequencies are vibrating inside your living room, but your radio is only tuned to one frequency.” And sometimes, for whatever reason, we hear two signals on our radio at once.
Given that, then, maybe we feel déjà vu when the atoms of which we consist “no longer vibrate in unison with these other universes,” when “we have decoupled from them, we have decohered from them.”’
Source: Open Culture