If I play the same thing twice [...] you will remember two different things. This is no hallucination, this is no deception, [...] it's not those... pejorative word... it's just how human being works.If you have reason to think things are different, you're likely to listen differently, you're likely to focus on different things, and you're likely to remember different things.Or if you're maybe convinced everything sounds the same... you're still yourself that way.So this makes the point whenever you do auditory testing, that any test that you do for auditory stimulii, it has to have falsifiable design. It means that you have to actually be able to tell if something is actually detected or if its something that you either conciously or subconciously steered yourself into notice. You have to be able to test that. Now, it basically means that you have to do a blind test.Because if you know what the two things are, your brain is gonna use this information. I don't care how smart you are, how trained you are, who you are, there hasn't been examples yet of somebody who can avoid. It's just life.