As soon as Trump interrupts himself, we’re compelled to pay even more attention to what he’s saying because we feel uncomfortable. We’re held in suspense. On a neurological level we want to hear the end of the sentence, we want the task to be complete and it’s very difficult to pull out attention away until it is. And, of course, that’s exactly where he inserts his pitch.
Trump’s Self-Interruptions: A Persuasion Tactic

It’s like Oooh! Oooh! Oooh!

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