The Defensive Activation Theory

If a system is used to having data coming in and suddenly it's not getting that data anymore, it fights back from the inside. So one example of this is, let's say, blindfolding or you also see this, for example, when people get thrown in solitary confinement in the dark. And so it starts generating itself. One more example is tinnitus, which is ringing in the ears. This typically comes about because somebody loses hearing in some frequency or some band of frequencies. The brain says, wait a minute, I'm not hearing anything at 12,000 Hertz anymore. So I'm going to start making myself and it starts making this sound by itself.