 PC models also show promise for explaining higher-level cognitive phenomena. An often-cited example is binocular rivalry. When presented with entirely different images in two eyes, humans report an oscillation between the two images as each in turn comes into “focus”. The PC explanation is that the system succeeds in eliminating error by predicting the scene for one eye, but only to increase the error for the other eye. So the system is unstable, “hunting” from one prediction to the other. Predictive coding also has a natural explanation for why we are unaware of our blind spot, for the lack of input in that area amounts to a report of no error, with the result that one perceives “more of the same”.