"Quantum interference—the crosstalk among similar quantum states—knits the different versions of your brain together."
"You're saying that my consciousness extends across multiple cosmi," I said. "That's a pretty wild statement."
"I'm saying all things do," Orolo said. "That comes with the polycosmic interpretation. The only thing exceptional about the brain is that it has found a way to use this."

Part 8, "Orithena" - Anathem (2008)