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Izzie: I'm looking, But, I don't see anything.
Derek: Because there's nothing there. The scan's clean.
Bailey: I told you.
Izzie: Then why is Denny back? The man's a hallucination, that means there has to be something there.
Bailey: Izzie, if it's clear then...
Izzie: I wanna go to this wedding. I wanna watch the bride walk down the aisle. I wanna hear the vows. I wanna catch the bouquet. I planned this wedding down to the very last detail. It's the perfect wedding. This wedding, is perfect. You know how much I wanna be there. So why would I tell you about Denny? Today of all days, why wouldn't I just wait? Denny is back. That means something is there.
Bailey: It's not like we can just map the brain for hallucinations the way we do with seizures.
Derek: Wait a minute. What are hallucinations?
Izzie: Hallucinations are neurons firing in the brain.
Derek: Well, it's never been done before. But if, if we can somehow induce your hallucination, there's a chance we could pick it up on an EEG. Then, we could pin point the part of the brain that's hallucinating.