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Lecture 9

KP122 Lecture 9: Kin Class 9.docx


Department
Kinesiology & Physical Education
Course Code
KP122
Professor
Quincy Almeida
Lecture
9

Page:
of 9
Kin Class 9 2015-02-06
Postural Reactions:
body righting and neck righting:
Tiulus: turn head sideward and body follows in rotation.
Duration: 2-6 months
Proprioception reaction *
Labyrinthine righting reflex – cat-like
Appears 2-3 months after birth
Disappears first year of life
Elicited: infant is held at waist and tilted forward
Response – neck extends to enable head to maintain upright position.
When two systems compete, i.e. when you are drunk the vestibular and vision systems fight with each other
and you get the spins and vomit.
Parachute – stimulus: lower infant to ground and the legs and arms will extend and abduct
Duration: 4 months to 2nd year.
Aka cat reflex
Protecting head and core organs
Pullup- appearance: 3rd month
Disappearance: one year
Elicited: holding the infant’s arms, tip in any direction
Response: arms flex or extend to maintain an upright position.
Proprioception and vestibular
Locomotor Reflexes:
-Crawling Reflex
Appearance: at birth
Disappearance: fifth or sixth month postnatally
Elicited: alternately stroking the soles of the feet
Response: crawling-like action
-Stepping or Walking Reflex
appearance: first few weeks after birthday
disappearance: fifth or sixth month
if one foot feels surface underneath it, there is a response that should lead towards a step.
There is debate over this reflex.
Is it a stepping or a withdrawal response?
Elicited by holding the infant upright with feet touching some kind of surface.
Response – stepping
Review:
Reflexive movement phase:
-allows infant to gain information about the immediate environment
-2 types: (primitive i.e. rooting and suckling) and (postural i.e. stepping and crawling)
-divided into 2 overlapping stages
-information encoding
-involuntary movements are seen in fetus up to 4 months
-primary means of gathering info, protecting itself, finding nourishment
-information decoding
-processing phase starts at 4 months
-gradual inhibition of reflexes as higher brain centers develop
-processing of sensory info relative to information stores (memory) start of perception
Rudimentary Phase:
First form of voluntary movement
-predictable and constant sequences
seen at birth until age of 2
Basic forms of voluntary movement required for survival
-development depends on biological, environmental, and type of task factors (RATE)
-primarily stability movements
-control of neck head and trunk muscles
-manipulative tasks: reach grasp and release