Perceptual organization

Objective: Explain perception and bottom-up processing, distinguish their meanings, and apply them to a described case.

Perception: Perception interprets and organizes sensory information. Bottom-up processing: Bottom-up processing builds interpretation from incoming sensory features. Sensation and perception are related but distinguishable stages of processing. Detection depends on signal properties, background conditions, and response criteria. Interpretation draws on incoming information and prior knowledge. Attention selects and organizes limited processing resources, so unnoticed information need not indicate an absent stimulus. Experimental tasks reveal mechanisms under specific conditions and do not prove that every real-world perception operates identically. Application: A viewer recognizes a pattern as a familiar object. This most directly illustrates perception. A viewer assembles edges and shapes into a recognition. This most directly illustrates bottom-up processing.

Objective: Explain top-down processing and figure-ground organization, distinguish their meanings, and apply them to a described case.

Top-down processing: Top-down processing uses knowledge, expectations, and context to influence interpretation. Figure-ground organization: Figure-ground organization separates a focal object from its surrounding background. Sensation and perception are related but distinguishable stages of processing. Detection depends on signal properties, background conditions, and response criteria. Interpretation draws on incoming information and prior knowledge. Attention selects and organizes limited processing resources, so unnoticed information need not indicate an absent stimulus. Experimental tasks reveal mechanisms under specific conditions and do not prove that every real-world perception operates identically. Application: A familiar sentence helps identify an unclear word. This most directly illustrates top-down processing. A viewer distinguishes a shape from the area behind it. This most directly illustrates figure-ground organization.

Objective: Explain depth cue and perceptual constancy, distinguish their meanings, and apply them to a described case.

Depth cue: A depth cue supplies information relevant to apparent distance. Perceptual constancy: Constancy supports relatively stable perceived properties despite changing sensory input. Sensation and perception are related but distinguishable stages of processing. Detection depends on signal properties, background conditions, and response criteria. Interpretation draws on incoming information and prior knowledge. Attention selects and organizes limited processing resources, so unnoticed information need not indicate an absent stimulus. Experimental tasks reveal mechanisms under specific conditions and do not prove that every real-world perception operates identically. Application: A nearer object partly blocks a farther object. This most directly illustrates depth cue. A familiar object's shape seems stable across viewing angles. This most directly illustrates perceptual constancy.