Mind Control
I think the author is kind of giving us hints and trying to tell us that the government is controling the minds of the people. By using the ear handicaps, the government is making sure that they don't over think anything and know what is really going on. The people can't remember what they were thing about, and the people that aren't smart enough to focus on something for very long won't know what is really going on anyways. If no one knows whats going on, the the government has complete control of what the people know.