" It's important to note that a top-down (or feed-backward) flow of information (from higher to lower layers) also occurs in the visual cortex; in fact, there are about ten times as many feed-backward connections as feed-forward ones. However the role of these backward connections is not well understood by neuroscientists, although it is well established that our prior knowledge and expectations, presumably stored in higher brain layers, strongly influence what we perceive. "

― Melanie Mitchell