Selective Attention
focusing conscious awareness on a particular stimulus
Inattentional Blindness
failing to see visible objects when our attention is directed elsewhere
Change Blindness
failing to notice changes in the environment; a form of inattentional blindness
Perceptual Set
a mental predisposition to perceive one thing and not another
Gestalt
an organized whole. Gestalt psychologists emphasized our tendency to integrate pieces of information into meaningful wholes.
Figure-Ground
the organization of the visual field into objects (the figures) that stand out from their surroundings (the ground).
Grouping
the perceptual tendency to organize stimuli into coherent groups
Depth Perception
the ability to see objects in three dimensions although the images that strike the retina are two-dimensional; allows us to judge distance
Visual Cliff
a laboratory device for testing depth perception in infants and young animals
Binocular Cues
depth cues, such as retinal disparity, that depend on the use of two eyes
Convergence
a cue to nearby objects' distance, enabled by the brain combining retinal images
Retinal Disparity
a binocular cue for perceiving depth. By comparing images from the retinas in the two eyes, the brain computes distance—the greater the disparity (difference) between the two images, the closer the object
Monocular Cues
a depth cue, such as interposition or linear perspective, available to either eye alone
Stroboscopic Movement
an illusion of continuous movement (as in a motion picture) experienced when viewing a rapid series of slightly varying still images
Phi Phenomenon
an illusion of movement created when two or more adjacent lights blink on and off in quick succession
Autokinetic Effect
the illusory movement of a still spot of light in a dark room
Perceptual Constancy
perceiving objects as unchanging (having consistent lightness, color, shape, and size) even as illumination and retinal images change
Color Constancy
perceiving familiar objects as having consistent color, even if changing illumination alters the wavelengths reflected by the object
Perceptual Adaptation
the ability to adjust to changed sensory input, including an artificially displaced or even inverted visual field
Cognition
all the mental activities associated with thinking, knowing, remembering, and communicating
Metacognition
cognition about cognition; keeping track of and evaluating our mental processes
Concepts
a mental grouping of similar objects, events, ideas, or people
Prototype
a mental image or best example of a category. Matching new items to a prototype provides a quick and easy method for sorting items into categories (as when comparing feathered creatures to a prototypical bird, such as a robin).
Schemas
a concept or framework that organizes and interprets information
Assimilate
interpreting our new experience in terms of our existing schemas
Accommodate
adapting our current schemas (understandings) to incorporate new information
Creativity
the ability to produce new and valuable ideas
Convergent Thinking
narrowing the available problem solutions to determine the single best solution
Divergent Thinking
expanding the number of possible problem solutions; creative thinking that diverges in different directions
Executive Functions
cognitive skills that work together, enabling us to generate, organize, plan, and implement goal-directed behavior
Algorithms
A methodical, logical rule or procedure that guarantees solving a particular problem. Contrasts with the usually speedier - but also more error-prone - use of heuristics
Heuristics
A simple thinking strategy - a mental shortcut - that often allows us to make judgment and solve problems efficiently; usually speedier, but more error-prone than algorithms
Insight
a sudden realization of a problem's solution; contrasts with strategy-based solutions
Confirmation Bias
a tendency to search for information that supports our preconceptions and to ignore or distort contradictory evidence
Fixation
in cognition, the inability to see a problem from a new perspective; an obstacle to problem solving
Mental Set
a tendency to approach a problem in one particular way, often a way that has been successful in the past
Intuition
an effortless, immediate, automatic feeling or thought, as contrasted with explicit, conscious reasoning
Representativeness Heuristic
judging the likelihood of events in terms of how well they seem to represent, or match, particular prototypes; may lead us to ignore other relevant information
Availability Heuristic
judging the likelihood of events based on their availability in memory; if instances come readily to mind (perhaps because of their vividness), we presume such events are common
Overconfidence
the tendency to be more confident than correct—to overestimate the accuracy of our beliefs and judgments
Belief Perseverance
the persistence of one's initial conceptions even after the basis on which they were formed has been discredited
Framing
the way an issue is posed; how an issue is framed can significantly affect decisions and judgments
Nudge
framing choices in a way that encourages people to make beneficial decisions