Chapter 4 Flashcards
cephalocaudal principle
the principle that growth follows a
pattern that begins with the head
and upper body parts and then
proceeds down to the rest of the
body
proximodistal principle
the principle that development
proceeds from the center of the
body outward
principle of hierarchical
integration
the principle that simple skills
typically
develop separately and
independently but are later integrated
into more complex skills
principle of the independence of
systems
the principle that different body
systems grow at different rates
neuron
the basic nerve cell of the nervous
system
synapse
the gap at the connection between
neurons, through which neurons
chemically communicate with one
another
nervous system
is composed of
the brain and the nerves that extend throughout the body
synaptic pruning
the elimination of neurons
as the result of nonuse or lack of
stimulation
myelin
a fatty substance that helps
insulate
neurons and speeds the
transmission of nerve impulses
cerebral cortex
the upper layer of the brain
shaken baby syndrome
in which an infant is shaken by a caretaker or parent,
usually out of frustration or anger due to a baby’s crying. Shaking can lead the brain to
rotate within the skull, causing blood vessels to tear and destroying the intricate connections
between neurons
plasticity
the degree to which a developing
structure or behavior is modifiable
due to experience
sensitive period
a specific, but limited, time, usually
early in an organism’s life,
during which the organism is
particularly susceptible to environmental
influences relating to some
particular facet of development
rhythms
repetitive, cyclical patterns of
behavior
state
the degree of awareness an infant
displays to both internal and
external stimulation
Awake states
Alert
Non-alert waking
Fuss
Cry
Alert
Attentive or scanning, the infant’s eyes are open, bright, and shining
Non-alert waking
Eyes are usually open but dull and unfocused. Varied, but typically
high motor activity.
Fuss
Fussing is continuous or intermittent, at low levels
cry
Intense vocalizations occurring singly or in succession
Transition states between sleep and waking
drowse
daze
sleep-wake transition