No, we are saying that - just like all humans - they are subject to perceptive biases in which the brain CHANGES what they percieve in a way that has nothing to do with the sound waves reaching their ears. This is happening all the time - we cannot turn it off - it is the way our senses work.
A visual example.
Horizontal lines paralell to each other - or not? You can
measure them and they are parallel. You can't "see" them that way, but it appears correctly on the retina of your eye (as correctly as that very imperfect instrument can do it)
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