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We use cookies to give you the best experience possible. Theories of perception tend to explain how the visual system operates in terms of two kinds of processes: bottom up, data driven ones, that are pre-attentive, and are a consequence of how the nervous system is structured and top down or concept driven processes which rely on experience, inference and expectations.

bottom Perception down top up

bottom Perception down top up

bottom Perception down top up

We actively construct our perception of reality. Object perception as Bayesian inference. Depth cues describe how this is achieved. The time course of visual processing: backward masking and natural scene categorisation. In cognitive terms, two thinking approaches are distinguished.

Evidence to Support Gregory's Theory

bottom Perception down top up

bottom Perception down top up

bottom Perception down top up

bottom Perception down top up

bottom Perception down top up

If perceptions make use of hypothesis testing the question can be asked 'what kind of hypotheses are they? One of these is known as bottom-up processing and the other is known as top-down processing. If so, then you have experienced how motivation to detect a meaningful stimulus can shift our ability to discriminate between a true sensory stimulus and background noise. Rather than looking at perception more holistically, including how sensory information, visual processes, and expectations contribute to how we see the world, bottom-up processing breaks the process down into its most basic elements.

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