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.
Con 'detectar' no me refiero a que digan: "Tendrás que haber cambiado mi respuesta", sino más bien: "Está bien, debo haber malinterpretado la pregunta. ¿Puedo cambiarla?".