“Part of what restricts us seeing things is that we have an expectation about what we will see, and we are actually perceptually restricted by that expectation. In a sense, expectation is the lost cousin of attention: both serve to reduce what we need to process of the world "out there". Attention is the more charismatic member, packaged and sold more effectively, but expectation is also a crucial part of what we see. Together they allow us to be functional, reducing the sensory chaos of the world into unbothersome and understandable units.”