Chapter 3 Flashcards
what is cephalocaudal pattern
a sequence in which the earliest growth always occurs at the top- the head-with physical growth in size weight, and differentiation of features gradually working their way down from top to bottom
shoulders, middle trunk and so on
what is proximodistal pattern
a sequence in which growth starts at the center of the body and moves toward the extremities
in what areas does the cephalocaudal pattern grow
e.g. head area, as the top parts of the head-the eyes and brain-grow faster than the lower parts, such as the jaw
according to the cephalocaudal pattern what generally proceeds in developing
sensory and motor development
according to the proximodistal pattern what is an example of what the baby can move first
e.g. infants control the muscles of their trunk and arms before they control their hands, and they use their whole hands before they can control several fingers
what does episodic mean according to growth
- growth occurring in spurts
- not smooth
- continuous
what is another name for nerve cells
neurons
does brain development continue after birth?
yes, extensive brain development continues after birth, through infancy, and later
why should a baby head be protected
brain is developing so rapidly in infancy
what is shaken baby syndrome
- brain swells
- hemorrhaging
when baby is shaken
at birth how much does a baby brain weigh
a 25th percent of its adult weight
what weight is a babys brain by their second birthday
75 percent of its adult weight
not mature uniformly
What does EEG stand for
electroencephalogram
what is EEG
measure of the brains electrical activity to learn about the brains development in infancy
what positive effects do high quality mother-infant interaction early in infancy cause
higher-quality frontal lobe functioning
what does fNIRS stand for
functional near-infrared spectroscopy
How does the fNIRS work
use very low levels of near-infrared light to monitor changes in blood oxygen
where is the forebrain
farthest from the spinal cord
includes;
- cerebral cortex
- several structures behind it
what is the cerebral cortex
covers the forebrain like a wrinkled cap
what are the four main lobes found in the cerebral cortex
- frontal lobe
- occipital lobe
- temporal lobe
- parietal lobe
how many hemispheres are there?
two halves in the brain
are the two hemisphere identical?
not identical in anatomy or function
what is lateralization
the specialization of function in one hemisphere of the cerebral cortex or the other; both needed for the complex functions
when do newborns show greater electrical brain activity in the left than the right
when listening to speech sounds
at birth the hemispheres of the cerebral cortex have started to specialize
true
what hemisphere is used when focusing in language, speech, and grammar?
left hemisphere in most people
what hemisphere is used when focusing on appropriate language used in different contexts, and the use of metaphor and humor?
right hemisphere
complex functions are directed by which hemisphere
both sides communicate
what is a neuron
nerve cell that handles information processing
what is an axon
a fiber that carries signals away from the cell body
what are dendrites
fiber carrying signals toward it
what is a myelin sheath
layer of fat cells encases many axons
what do neurons send
electrical and chemical signals
communicate with eachother
what are the two types of fibers that extend from a neurons cell body
axons and dendrites
what is the purpose of the myelin sheath
- provides insulation
- helps electrical signals travel faster down the the axon
- providing energy to neurons
- facilitating communication
what are neurotransmitters
terminal buttons at end of axon that release chemicals (neurotransmitters)
what are synapses
tiny gaps between neurons
what happens when axons and dendrites connect when there are chemical interactions in the synapses
- allow information to pass from one neuron to another
what is the first process of myelination
- process of encasing axons with fat cells
- speeds up neural transmissions
- expansion of dendritic connections facilitates the spreading of neural pathways in infant development
how long does the myelination process last
- begins prenatal
- continue childhood
- and adolescence
what is the second process of myelination
- neuron connectivity increases (creating new neuron pathways)
- new dendrites grow
- connections among dendrites increase
- synaptic connections between axons and dendrites proliferate
what happens to synaptic connections that are never used
replaced by other pathways or disappear
what happens to synaptic connections that are used
become stronger and survive/”pruned”
what happens in the prefrontal cortex
- higher level thinking
- self regulation occur
- peak of overproduction occurs at just over 3 years of age until middle to late adolescence where adult density of synapses is achieved
what is thought to influence the timing and course of synaptic overproduction and subsequent retraction
heredity and environment
when does myelination occur and get completed for visual pathways?
rapidly after birth
completed in the first 6 months
when does myelination get completed for auditory pathways
not completed until 4 or 5 years of age
what inflowing stream help shape neural connections in the environment of early experience and the brain
- sights
- sounds
- smells
- touches
- language
- eye contact
what does having depressed brain activity have to do with environment
connection with growing up in a deprived environment
what happen when the brain looses brain tissue
it recovers and adapts
what does brain development depend on
context
what does the brain have
plasticity
what is the neuroconstructivist view
biological processes (e.g. genes) and environmental conditions (e.g. enriched or impoverished) influence the brains development in two ways
what is the first way in the neuroconstructivist view that is believed to influence the brains development
the brain has plasticity and is context dependent
what is the second way in the neuroconstructivist view that is believed to influence the brains development
that development of the brain and childs cognitive development are closely linked
what does the neurocontructivist view emphasize
interactions between experiences and gene expression in the brains development are important (such as epigenetic view proposes)
what does REM stand for
Rapid Eye Movement
what is REM thought to do in infancy
promote infants brain development
what does SIDS stand for
sudden infant death syndrome
what is SIDS
- infant stops breathing
(usually during night)
-dies
how many annual deaths has SIDS caused
2,000
what period of infancy is SIDS risk the highest
2 to 4 months
what reduces the risk of SIDS
sleeping on their backs
why does sleeping on their back decrease chances of SIDS
- access to fresh air
- reduces chances of getting overheated
what can abnormal brain stem function involving the neurotransmitter serotonin cause in infants
SiDS
what does the gene mutation of heart arrhythmias cause in infants
SIDS (10 to 15 percent)
to which infants are SIDS less common
breast fed infants
to which infants are SIDS more common
- second hand smoke
- low birth weight infants
- African American infants
- Eskimo infants
- exposed to cigarette smoke
- sleep with/same bed as parents
- bedroom with no fan
what are two factors that best predict SIDS
- maternal smoking
- bed sharing
what does infant sleep positively benefit in cognitive development
- better memory
- language
- executive function
what does the link between infant sleep and children’s cognitive function bring
- brain maturation
- memory consolidation
(improves daytime alertness + learning)
what happened to infants who had more sleeping problems
emotional dysregulation at 2 to 3 years of age
- poor attention functioning in elementary school
during the first six months where does the infant obtain nutrients and energy
- human milk
- alternative formula
what are the benefits of breast feeding
first two years of life+
- appropriate weight gain
- reduced risk of child and adult obesity
- fewer gastrointestinal infections
- fewer respiratory tract infections
- small increase in child intelligence
- protects against wheezing (may or may not prevent asthma)
- fewer ear, throat, and sinus infections
what benefit does breast feeding bring to mothers
- reduction of hospitalization for cardiovascular functioning
- lower incidence of breast cancer
- reduction in ovarian cancer
when should a woman not breastfeed?
- having AIDS
- infectious disease that can be transmitted
- active tuberculosis
- taking drugs
what are the types of research done on breast feeding vs bottle fed babies
correlational studies
what types of environments do infants need
- nutritional
- supportive
- nurturing
what happens when an infant develops according to their nutritional need supply
strength and coordination required for motor development
what is dynamic systems theory
perspective on motor development that seeks to explain how motor behaviors are assembled for perceiving and acting
what does perceiving and acting refer to in the dynamic systems theory
perceiving - perceive something in their environment that motivates them to act
perception - fine-tune their movements
(represent pathways to infants goals)
what is “tune” for an infant
repeated cycles of action then perception of the consequences of those actions
(using motor skills)
according to dynamic systems, how does an infant promote motor development
infant actively puts together a skill in order to achieve a goal within the constraints set by the infants body and environment
what are reflexes
- built in reactions to stimuli
- genetically carried survival mechanisms
- automatic + involuntary
e.g. when immersed in water, the baby automatically holds its breath and contracts its throat to keep water out
what is the stimulant for the rooting reflex
cheek stroked or side of mouth touched
what is the infants response to having its cheek stroked or side of mouth touched according to its rooting reflex
turns head, opens mouth, begins sucking
what does the rooting reflex disappear
3 to 4 months
what is the sucking reflex stimulant
object put in their mouth
what is the infants response to an object touching their mouth
sucks automatically
side note: allows newborns to get nourishment before they have associated a nippe with food
when does the sucking reflex disappear
3 to 4 months
what is the Moro (startle) reflex stimulant
sudden stimulation, such as hearing loud noise or being dropped
what happens when a sudden stimulation such as hearing a loud noise or being dropped happens to an infant
- startled
- arches back
- throws head back
- flings out arms and legs
- rapidly closes them to center of body
when does Moro (startle) reflex disappear
3 to 4 months
what is blinking reflex in an infant stimulant
flash of light
puff of air
what is the infants response to the blinking reflex
closes both eyes
when does the blinking reflex disappear
permanent
what is the Babinski reflex stimulant in an infant
sole of foot stroked