Bottom-up processing refers to processing sensory information as it is coming in. Top-down processing, on the other hand, refers to perception that is driven.
Bottom-up refers to the way it is built up from the smallest pieces of sensory information. Top-down processing, on the other hand, refers to perception that is .
Generally speaking, there are two approaches to understanding the process of perception. These are the top-down processing and the bottom-up processing.