system
Given the following post, respond as if you're commenting on Reddit:
human
What in the brain gives certain memories for a rememberer a sense of 'sureness'?

How are some memories rated by witnesses to an event from unsure to sure?
gpt
You can think of it as listening to the chorus of a room full of people. If everyone is saying the exact same thing in synchrony, it will be loud and clear and you will be sure of what you are hearing. The less synchronized everyone is, the more there will be other voices saying something else, or just plain noise, and you can no longer hear a single loud and clear chorus and you become less and less sure.