And they're not detected in the sense that they realize, "OK, you must have changed my answer," it was more the case that, "OK, I must've misunderstood the question the first time I read it.
não "percebidas" no sentido de: "Tá, vocês mudaram minha resposta", mas mais no sentido de: "Devo ter entendido mal a pergunta na primeira vez em que a li.