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Infancy
Chapter 5
28
Psychology
Undergraduate 3
10/24/2012

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Term
sensation
Definition
the processing of basic information from the external world by the sensory receptors in the sense organs (eyes, ears, skin, etc.) and brain
Term
perception
Definition
the process of organizing and interpreting sensory information
Term
preferential-looking technique
Definition
a method for studying visual attention in infants that involves showing infants two patterns or two objects at a time to see if the infants have a preference for one over the other
Term
visual acuity
Definition
the sharpness of visual discrimination
Term
contrast sensitivity
Definition
the ability to detect differences in light and dark areas in a visual pattern
Term
cones
Definition
the light-sensitive neurons that are highly concentrated in the fovea (the central region of the retina)
Term
perceptual constancy
Definition
the perception of objects as being of constant size, shape, color, etc. in spite of physical differences in the retinal image of the object
Term
object segregation
Definition
the identification of separate objects in a visual array
Term
optical expansion
Definition
a depth cue in which an object occludes increasingly more of the background, indicating that the object is approaching
Term
binocular disparity
Definition
the difference between the retinal image of an object in each eye that results in two slightly different signals being sent to the brain
Term
stereopsis
Definition
the process by which the visual cortex combines the differing neural signals caused by binocular disparity, resulting in the perception of depth
Term
monocular or pictorial cues
Definition
the perceptual cues of depth (such as relative size and interposition) that can be perceived by one eye alone
Term
auditory localization
Definition
perception of the location in space of a sound source
Term
intermodal perception
Definition
the combining of information from two or more sensory systems
Term
reflexes
Definition
innate, fixed patterns of action that occur in response to particular stimulation
Term
prereaching movements
Definition
clumsy, swiping movements by young infants toward the general vicinity of objects they see
Term
self-locomotion
Definition
the ability to move oneself around in the environment
Term
scale error
Definition
the attempt by a young child to perform an action on a miniature object that is impossible due to the large discrepancy in the relative sizes of the child and the object
Term
differentiation
Definition
the extraction from the constantly changing stimulation in the environment of those elements that are invariant, or stable
Term
affordances
Definition
the possibilities for action offered by objects and situations
Term
classical conditioning
Definition
a form of learning that consists of associating an initially neutral stimulus with a stimulus that always evokes a particular reflexive response
Term
unconditioned stimulus (US)
Definition
a stimulus that evokes a reflexive response
Term
unconditional response (UR)
Definition
a reflexive response that is elicited by the unconditioned stimulus
Term
conditioned stimulus (CS)
Definition
the neutral stimulus that is repeatedly paired with the unconditioned stimulus
Term
conditioned response (CR)
Definition
the originally reflexive response that comes to be elicited by the conditioned stimulus
Term
instrumental or operant conditioning
Definition
learning the relation between one's own behavior and the consequences that result from it
Term
positive reinforcement
Definition
a reward that reliably follows a behavior and increases the likelihood that the behavior will be repeated
Term
violation-of-expectancy
Definition
a procedure used to study infant cognition in which infants are shown an event that should evoke surprise or interest if it violates something the infant knows or assumes to be true
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