> "It’s the minimum human response time to anything...It’s the time that runners take to respond to a starting pistol—and that's just a simple signal" i.e. the

> "It’s the minimum human response time to anything...It’s the time that runners take to respond to a starting pistol—and that's just a simple signal" i.e. the gap is typically exactly as long as it takes for us to react to the "simple signal" that the other person has stopped speaking and now it is our turn. It does prove that we must be planning our response before the other person has finished speaking, but I wonder if that's such a surprising thing to prove: words and sentences take a lot longer to say out loud than they do to comprehend.