Lecture 5 Flashcards
postural reactions occur as a response to
the experience of gravity
sequential
across cultures, despite individual differences
timing may differ but it still occurs within the same order
cephalocaudal
development occurs from head to foot
proximodistally
development occurs from proximal to distal
proximal stability leads to distal mobility
stability & mobility
the relationship between these is postural control
proximal stability leads to distal mobility
sensory input affects motor output
first movements are reflexive, initiated by sensation & become voluntary with experience (foundation for all motor & development control
how does hand development occur????
ulnarly to radially
refinement occurs as development goes further distally
why ulnar grasp occurs first & why babies use WHOLE hand to palm something
somatosensory
body scheme – internal sensory system
includes: tactile, proprioception, vestibular
tactile
touch — light touch
proprioception
unconscious awareness of sensation coming from one’s joints, muscles, tendons & ligaments “the positioning sense”
activated by movement – using force
ex of dysfunction: maddie picks up water cup too fast & it spills everywhere
vestibular
sensory input received by the inner ear, regarding: head position, movement & balance
coordinated movement
- responsible for sense of arousal – why we rock a baby to sleep
- responsible for 2 handed crossing of midline
sight @ 1 month
- discerning faces (1 mo old babies can distinguish momma face from strangers
sight at 3 months
baby can distinguish momma from stranger based on face alone
pupils react to light
bright lights appear to be unpleasant to newborn
allows object in line of vision
sight during the first couple of months (colors)
can distinguish patterns
respond to blacks & reds
sight @ 5 or 6 months
babies can discern colors
sight at 6 months
baby can see a few feet away (20/100)
sight at 8 months
baby can see across room (20/60)
depth perception – visual cliff experiment
3 month old babies
heartbeat decreases at ledge —
this can conclude that babies don’t understand the concept of depth perception at this point
depth perception – visual cliff experiment – 6 month old babies
heartbeat increases at ledge — babies would not cross it, although some did when momma prompted them too
THIS SHOWS WE HAVE DEPTH PERCEPTION!
when are ordinary sounds heard
in utero — well before 10 days of life
newborn responds to sounds by
crying
eye movement
stopping activity – startle reaction
sounds @ 1 month old
babies distinguish between the smallest variations in sound
sounds @ 6 months old
development of ability to understand and make sounds necessary for language structure
smell @ 1 day old
distinguish between some smells
smell milk @ nipple
smell at 1.5 months old
infants can distinguish smell of mother vs strangers
leave something with mommas smell on it keep baby comfy
taste – newborns taste preferences
prefer sweet & salty —
dislike bitter tasting things
taste development in utero
lick placenta wall - maybe helped to develop a sense of taste at birth
touch & babies
born with well developed sense of touch — overtime they use this most
- primary means of exploration
- most developed sense @ birth
- greatest sensitivity at fingertips/mouth
- provides internal information regarding the self & continues to body image
reflex
predictable stereotyped involuntary response to a given stimulus
the cerebellum is where
sensory integration occurs
cerebrum is where
voluntary control of cognitive center & the need to build the best controlled movement
primitive reflexes
predictable motor behaviors present at birth
1) SPECIFIC DURATION- emerge in utero…inhibited/cntrld by higher brain centers at 6-12 months to allow for more sophisticated neural structures to develop — allows for voluntary motor control —–correlates with the acquisition of motor skills
2) SPECIFIC FUNCTION- survival, protection, nutrition, subsequent motor dev
3) CAUSE FOR CONCERN WHEN IRREGULAR
- neurological integrity
Assessment of primitive reflex
tool for: diagnosis, treatment planning, measuring progress
stimulate primitive reflexes & look at expected response
infant assessment of primitive reflexes
not present, asymmetrical, may be indicative of CNS insult/pathology (leision, structural problem etc)
AT 1 YEAR IF PRIMITIVE REFLEX IS NOT INTEGRATED (still present) that may suggest
1) CNS pathology - (CP, leison, structural problem)
2) neurodevelopment delay- (NDD, processing immaturatity- ADHD, ASD, LD, dyslexia)
persistence of primitive reflex will limit
volitional motor control – atypical motor behavior patterns (coordination/posture), impede motor (strength/refinement) and sensory development, affect development of postural reflexes – cause immature patterns to remain prevalent
BOTTOM UP treatment of primitive reflexes
remediation!!
- facilitate typical movement patterns –> inhibit reflexes & improve motor control to achieve functional skill/performance
- knowing what reflex is retained helps therapist make sense of functional limitations, plan for appropriate treatment activities
FIX FOUNDATIONAL ISSUE
TOP DOWN treatment of primitive reflexes
task modification!!
use a retained reflex to perform a functional skill
more common with CNS pathologies
ex: have a child with CP bunny hop for mobility
progression of treating primitive reflexes
we can easily re-evaluate for the presence of a reflex
– progress is based on decreased reflex intensity, complete reflex integration, improved volitional motor control
palmar grasp - what does it look like & typical age
palm is stimulated
- 4 fingers not the thumb close
duration - 5 months gestation & 4 months postpartum
function of palmar grasp
survival - hold onto parent in case of danger
concerns w palmar grasp
no palmar grasp - indicative of neurological problems
persists after 4 months old- impact grasp patterns & fine motor coordination - also causes oral motor overflow