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PSYB360 Ch. 4
Ch 4 Key Terms
29
Psychology
Undergraduate 3
09/14/2012

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Term
reflex
Definition
an inborn, automatic response to a particular form of stimulation.
Term
states of arousal
Definition
degrees of sleep and wakefulness
Term
rapid-eye-movement (REM) sleep
Definition
brain-wave activity, measured with the EEG, is remarkably similar to that of  the waking state. The eyes dart beneath the lids; heart rate, blood pressure, and breathing   are uneven; and slight body movements occur.
Term
non-rapid-eye-movement (NREM) sleep
Definition
the body is almost motionless, and heart rate, breathing, and brain-wave activity are slow and even.
Term
sudden infant death syndrome (SIDS),
Definition
the unexpected death, usually   during the night, of an infant younger than 1 year of age that remains unexplained after thorough investigation.
Term
Neonatal Behavioral Assessment Scale (NBAS)
Definition
evaluates the baby’s reflexes, muscle tone,   state changes, responsiveness to physical and social stimuli, and other reactions
Term
classical conditioning
Definition
In this form of learning, a neutral stimulus is paired with a stimulus that leads   to a reflexive response. Once the baby’s nervous system makes the connection between the   two stimuli, the new stimulus produces the behavior by itself.
Term
operant conditioning
Definition
infants act, or operate,  on the environment, and stimuli that follow   their behavior change the probability that the behavior will occur again.
Term
reinforcer
Definition
A stimulus that increases the occurrence of a response
Term
punishment
Definition
Removing a desirable stimulus or presenting an  unpleasant one to decrease the occurrence of a response is called
Term
Habituation
Definition
gradual reduction in the strength of a response due to repetitive stimulation.
Term
recovery
Definition
a new stimulus—a change in the environment—causes the habituated response to return to a high level
Term
mirror neurons
Definition
specialized cells in many areas of the cerebral cortex of  primates which fire identically when a primate hears or sees an action and when it carries out that action on its own
Term
Gross-motor development
Definition
refers to control over actions that help infants get around in the environment, such as crawling, standing, and walking.
Term
Fine-motor development
Definition
smaller movements, such as reaching and grasping.
Term
dynamic systems theory of motor development
Definition
mastery of motor skills  involves acquiring increasingly complex systems of action. When motor skills work as a system, separate abilities blend together, each cooperating with others to produce more effective   ways of exploring and controlling the environment.
Term
pre-reaching,
Definition
poorly coordinated swipes at objects in front of them
Term
ulnar grasp
Definition
a clumsy motion in which the baby’s fingers close against the palm.
Term
pincer grasp
Definition
By the end of the first year, infants use the thumb and index finger to grasp objects
Term
perceptual narrowing effect
Definition
perceptual sensitivity that becomes increasingly attuned with age to information most often encountered.
Term
visual acuity
Definition
fineness of discrimination
Term
visual cliff
Definition
designed by Eleanor Gibson and Richard Walk (1960) and used in the earliest studies of depth  perception. It consists of a Plexiglas-covered table with a platform at the center, a “shallow” side with a checkerboard pattern just under the glass, and a “deep” side with a checkerboard several feet below the glass.
Term
contrast sensitivity
Definition
explains early pattern preferences (Banks &   Ginsburg ,  1985). Contrast refers to the difference in the   amount of light between adjacent regions in a pattern. If  babies are sensitive to (can detect) the contrast in two or more patterns, they prefer the one with more contrast.
Term
Size constancy
Definition
perception of an object’s size as the same, despite changes in the size of  its retinal image
Term
shape constancy
Definition
Perception of an object’s shape as stable, despite changes   in the shape projected on the retina
Term
intermodal perception
Definition
we make sense of these running streams of light, sound, tactile, odor, and taste information, perceiving them as   integrated wholes.
Term
amodal sensory properties
Definition
information that is not specific to a   single modality but that overlaps two or more sensory systems,
Term
differentiation theory
Definition
infants actively search for  invariant features of the environment—those that  remain stable—in a constantly changing perceptual world.
Term
affordances
Definition
the action possibilities that  a situation offers an organism with certain motor capabilities
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