It might be funny but expectation bias is real and is a fact. For example, if you break this in for 1000 hours you will hear less grain, etc, it plants the seed, and for some the seed grows as planted. This forum has had flip floppers on it as well.
This guy changed because he did the ABX test on WIner's files & could hear the difference whereas sighted he could not hear the difference in the 20 pass file. He previously couldn't hear differences between DACs also
So yes expectation bias is a powerful thing, tomelex, in this case
negative expectation bias prevented him from hearing differences that were there.
I would say that this nocebo effect is much more prevalent than realised & is hardly ever tested for - the emphasis is always on testing for false positives, not false negatives - that was the point of the last 50 pages on Amir's ABX thread - the use of controls in blind tests - please don't rake it up again.
MY post above was in reply to cgabriel's post & the piece you just highlighted - how sometime what seems an absurd position & argument is often because of a bias in thinking & how when a viewpoint flips that absurdity also flips. It's just an interesting observation, that's all.
Finally, I wouldn't say this person was a flip-flopper - his perception opened up to being able to perceive what is actually there - he's much more aware of how his thinking & external pressures can influence his perception