perception

Perception

The process by which the brain interprets and makes sense of external sensory stimuli.

Top-down processing

Perceptual processing driven by previous knowledge, expectations, and context to interpret incoming information.

Bottom-up processing

Perceptual processing that starts with raw sensory details and builds up to a complete mental representation.

Selective attention

Focusing awareness on a specific stimulus while filtering out other competing stimuli.

Cocktail party phenomenon

The ability to focus on a single conversation in a noisy environment while remaining sensitive to key stimuli, like hearing one's own name.

Inattentional blindness

Failing to notice a visible object or event because attention is directed elsewhere.

Change blindness

Failing to notice alterations or differences in a visual scene over time.

Gestalt psychology

A branch of psychology emphasizing that humans organize sensory inputs into meaningful whole patterns rather than isolated parts.

Figure-ground separation

The perceptual organization of a visual field into a primary object of focus and its surrounding background.

Similarity (Gestalt principle)

The perceptual tendency to group together visual elements that share similar physical characteristics.

Proximity (Gestalt principle)

The perceptual tendency to group together objects that are physically close to one another.

Closure (Gestalt principle)

The perceptual tendency to fill in gaps or missing parts to perceive an incomplete figure as a whole object.

Depth perception

The spatial ability to perceive the world in three dimensions and judge distance.

Visual cliff

A glass-covered apparatus with an apparent drop-off, used to test depth perception in infants and animals.

Binocular cues

Visual depth cues that depend on the use and coordination of both eyes.

Retinal disparity

A depth cue resulting from the slightly different images received by each eye, allowing the brain to compute object distance.

Convergence

A neuromuscular depth cue involving the inward rotation of the eyes when focusing on nearby objects.

Monocular cues

Visual depth cues that can be processed using only one eye independently.

Relative clarity

A monocular depth cue where sharper, clearer objects are perceived as closer than hazy or blurry objects.

Relative size

A monocular depth cue where smaller retinal images are perceived as farther away if two objects are assumed to be equal in actual size.

Texture gradient

A monocular depth cue where distinct, detailed surfaces appear closer, while fine or blended textures signal distance.

Linear perspective

A monocular depth cue where parallel lines appear to converge as they recede toward a horizon point.

Interposition

A monocular depth cue where an object that partially overlaps or blocks another is perceived as being closer.

Motion parallax

A monocular depth cue where nearby objects appear to move past quickly in the opposite direction of motion, while distant objects move slowly.

Phi phenomenon

An illusion of apparent movement created when stationary lights flash on and off in rapid succession.

Stroboscopic movement

An illusion of motion created when a sequence of still images is shown in rapid succession.

Autokinetic effect

The false perception that a stationary spot of light in a dark room is moving.

Schema

A mental framework organized from past experiences that guides perception and interpretation of new information.

Priming

An implicit memory effect where prior exposure to a stimulus influences the response to a subsequent stimulus.

Context effects

The influence of surrounding environmental factors on how a stimulus is perceived.

Perceptual constancy

The ability to recognize that an object maintains its identity and properties even as the sensory image on the retina changes.

Shape constancy

Perceiving an object as maintaining its structure even when its orientation or viewing angle alters its retinal image.

Size constancy

Perceiving an object as maintaining its physical dimensions regardless of changes in distance or retinal image size.

Color constancy

Perceiving an object as maintaining its hue despite changes in environmental illumination.