Concepts are a source for expectancies.
Concepts. As we develop concepts about the world, they become, in turn, screens through which we see the world. Let me refer back to my example before of “glancing into my on-campus classroom for a fraction of a second and then writing a 10 page essay on what you saw.
The reason you can process this volume of information from such a short glance, is that you have a concept (expectancy) of what a college classroom is all about.
Your transducer needs, then, only enough input to steer you in the direction of that mental set, and then all the information you already have about classrooms in can be added to the creation of the percept (your experience of what you saw).
But something may be lost too, in that you may have missed seeing that I was prancing on stage in a sumo suit waving a spear and reading excerpts from Winnie the Pooh. That is the price we pay for using expectancies, and also for attending a class II University.