Topic summary
What this topic is about
Tim describes perception as the brain's organization and interpretation of sensory information. The review contrasts data-driven and expectation-driven processing, then covers attention, Gestalt organization, depth cues, and perceptual constancies. Depth cues include overlap, relative size, and differences between the eyes; constancies help objects seem stable as viewing conditions change.
Key ideas
- Bottom-up processing builds a perception from incoming sensory details; top-down processing uses prior knowledge and expectations.
- Selective attention focuses awareness on some information while filtering other input; the cocktail party effect is one example.
- Gestalt principles such as figure-ground, closure, proximity, and similarity explain how we group parts into wholes.
- Monocular and binocular cues help us perceive depth.
- Size, shape, and color constancy help objects seem stable even when viewing conditions change.
Common confusion
Sensation supplies input; perception organizes and interprets that input, often using both sensory details and expectations.
Review connection
Review this in the Unit 2 Review video, then try the Topic 2.1 Practice Quiz.
Reviewed by Tim Steadman